JPH1185090A - Fluorescent display tube drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent display tube drive system with an excellent cost performance by simplifying a system in a fluorescent display tube drive system. SOLUTION: This fluorescent is play tube drive system comprises a data terminal 102 and a clock terminal 101 for data transfer, a shift register 104 for temporarily storing transferred data, a data register 105 for saving forwarded data, high withstanding voltage ports 106, 107 and drive terminals 108, 109 for transferring the data saved in this data register 105 to the fluorescent display tube, and an output permission terminal 103 for permitting an output period of the high withstanding voltage port 106, 107.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display driving device.

[0002]

2. Description of the Related Art FIG. 32 shows a circuit configuration of a conventional fluorescent display tube driving device (hereinafter abbreviated as FL driver).
3, FIG. 34 is a schematic diagram of a fluorescent display tube and its timing chart.

In FIG. 32, 101 is a serial clock input terminal, 102 is a serial data input terminal, 104
Is a shift register, 105 is a data register, 106 is a high withstand voltage output port for grid, 107 is a high withstand voltage output port for anode, 108 is a grid drive terminal (DEG terminal), 109 is an anode drive terminal (SEG terminal), 28
01 is a fluorescent display tube driving device control circuit, 2802 is a display R
AM. In FIG. 33, reference numeral 2901 denotes a grid, 2
Reference numerals 902 and 2903 are anodes.

The display data transferred by serial is
Display RAM via shift register / data register
Is stored in Next, control data of the fluorescent display tube driving device control circuit is serially transferred, and the fluorescent display tube is driven.

In FIG. 33, the fluorescent display tube is turned on when both the anode and the grid are at a high level, and is turned off when one of them is at a low level. For example, in FIG. 33, when lighting a of DEG0, DEG0 may be set to a high level and SEGa may be set to a high level. further,
Using the afterimage phenomenon of the human eye, DEG0, DEG1, DEG2,.
An arbitrary display can be made by repeating the lighting of n. This is represented by the timing chart of FIG. Each time each digit goes high, the segment drive data is transferred from the display RAM to the anode high withstand voltage port. Therefore, as the display digits increase, the display R
AM will be huge.

[0006]

At present, in a MOS integrated circuit (hereinafter, LSI), miniaturization is progressing with an increase in the scale of a circuit to be mounted. For this reason, the withstand voltage of MOS transistors is decreasing year by year with miniaturization. It is known that a MOS transistor can be miniaturized at a fixed rate by a scaling method. However, in order to ensure the withstand voltage of driving the fluorescent display tube, the fluorescent display tube driving section must use the same transistor size as the conventional one even if scaling is performed. For this reason, the ratio of the fluorescent display tube driving unit to the chip becomes large, and even if miniaturization is performed, the chip size is determined by the high withstand voltage output transistor, and the chip size cannot be reduced by scaling.
Cost merit is no longer available.

On the other hand, the driving voltage of the fluorescent display tube increases as the number of displays increases. For this reason,
It is extremely difficult to develop an LSI incorporating a fluorescent display driving device in terms of process. For this reason, there is a limit to the reduction in set cost due to the integration of the LSI incorporating the fluorescent display tube driving device into one chip.

Further, the operating power supply voltage range has become smaller with the miniaturization of the MOS process, and furthermore, with the integration of analog circuits, the environment has become more severe against noise. For this reason, it can be said that a one-chip LSI equipped with a fluorescent display tube driving device that drives a large voltage is disadvantageous in terms of noise.

For these reasons, if all circuits for driving a fluorescent display tube are mounted on an LSI on a conventional extension line, the chip size cannot be reduced.
It is impossible to lower the system price in the set.

In recent years, the fluorescent display tube has been made into a universal grid as shown in FIG. This means that the anode is configured to span multiple grids, and the anode must be lit while multiple grids are turned on. For this purpose, the lit grid and the anode information must be stored in the display RAM. Therefore, a new control circuit and a display RAM area need to be expanded.

[0011]

Means for Solving the Problems In order to solve the above problems, the present invention has the following arrangement.

According to a first aspect of the present invention, there is provided a fluorescent display driving apparatus, comprising: a shift register for inputting a clock from a serial clock input terminal and inputting data from a serial data input terminal; and storing data transferred to the shift register. A register, an output of the data register as the other input, a signal from the output enable terminal as one input, a high withstand voltage output port for driving the fluorescent display tube grid, and a high withstand voltage output port for driving the fluorescent display tube anode. , A DEG terminal for driving the anode of the fluorescent display tube and an SEG terminal for driving the grid.

According to a second aspect of the present invention, there is provided a fluorescent display tube driving device according to the first aspect, wherein the high withstand voltage output port for driving the fluorescent display tube grid and the high withstand voltage output port for driving the anode are connected to a high withstand voltage output port having the same capacity. It was done.

According to a third aspect of the present invention, there is provided a fluorescent display driving apparatus as set forth in the first and second aspects, wherein the output of the data register is an AN.
As one input of the D circuit, the input of the output permission terminal is used as the other input of the AND circuit input, the output of the AND circuit is used as the input of the high voltage output transistor, and the output of the high voltage transistor is used for driving the fluorescent display tube. It is connected to the terminal.

According to a fourth aspect of the present invention, there is provided a fluorescent display driving apparatus according to any one of the first to third aspects, further comprising a synchronizing signal input terminal, the input signal being one input, and the serial clock being the other input. The shift register and the data register are controlled by the output of the control circuit, and the shift register is provided with a data output terminal.

A fifth aspect of the present invention provides a fluorescent display tube driving apparatus according to the first to fourth aspects, further comprising a transfer data determining circuit for determining whether the transferred shift register data is normal or abnormal.

According to a sixth aspect of the present invention, there is provided a fluorescent display driving apparatus according to the fifth aspect, further comprising a circuit for determining whether the transferred data of the shift register is normal or abnormal, and outputting a determination result from a data transfer result determination terminal. It has a configuration.

According to a seventh aspect of the present invention, there is provided a fluorescent display driving apparatus according to the first to sixth aspects, further comprising a transfer data determining circuit for determining whether the transferred shift register data is normal or abnormal. The output of the transfer data discriminating circuit is connected to the input of the n-type MOS transistor, and the output enable terminal is connected to the power supply voltage level via a pull-up resistor. It is configured to be fixed to.

According to another aspect of the present invention, a microcomputer for controlling a fluorescent display driving device transfers data of a storage device to a shift register via a bus line, and the shift register is controlled by a fluorescent display driving device control circuit. A configuration including an output permission terminal for outputting a high voltage terminal output permission signal generated by the fluorescent display tube driving device control circuit, the data being transferred from the serial data transfer terminal in synchronization with the generated clock signal. You are.

According to a ninth aspect of the present invention, there is provided a microcomputer for controlling a fluorescent display driving device, wherein the data is transferred from the storage device to the shift register by using direct memory access. The configuration is such that sequential data transfer control by an instruction is not required.

According to a tenth aspect of the present invention, there is provided a microcomputer for controlling a fluorescent display driving device according to the eighth aspect, further comprising an automatic transfer data register in place of the storage device, wherein the serial data is transferred to the microcomputer during the automatic transfer. The configuration eliminates the need for computer intervention.

In the microcomputer for controlling a fluorescent display tube driving device according to the present invention, an n-type MOS transistor is connected to an output permission signal terminal, and furthermore, a pull-up resistor is connected thereto. , Which is fixed to the power supply voltage level and is further input to the fluorescent display tube control circuit via the input buffer, so that the output permission terminal can always be monitored.

According to a twelfth aspect of the present invention, in the microcomputer for controlling a fluorescent display driving device according to the eighth to eleventh aspects, the output permission signal is controlled by an output of a pulse width modulation circuit (hereinafter, PWM). .

According to a thirteenth aspect of the present invention, there is provided a fluorescent display tube control system according to any one of the first to eighth aspects, and one of the serial data terminals of the microcomputer according to the ninth to twelfth aspects. It has a configuration in which a serial clock terminal and an output permission terminal are connected to each other, and a high withstand voltage output terminal of the fluorescent display tube driving device is connected to the fluorescent display tube.

[0027] According to a fourteenth aspect of the present invention, there is provided a microcomputer according to the ninth to twelfth aspects of the present invention, wherein two or more of the fluorescent display tube driving devices according to the first to eighth aspects are connected in parallel. , A serial data terminal, a serial clock terminal, and an output permission terminal are connected to each other, and the high withstand voltage output terminal of the fluorescent display tube driving device is connected to the fluorescent display tube.

According to a fifteenth aspect of the present invention, there is provided a fluorescent display driving system according to any one of the first to eighth aspects, wherein the semiconductor device has one of the same number of pins, and the same pin pitch and package width. By selecting a package, a set with a small number of displays is selected, and a package with a small number of pins is used to select a fluorescent display tube driving device with a small number of high withstand voltage terminals for driving a fluorescent display tube. Using a multi-pin package, control signals for serial clock, serial data, output control pins, etc.
The same pin arrangement is used for the low pin count and the high pin count, and the board design in the set is designed so that the positions of both the high pin count package and the low pin count package can be overlapped. The same board is used for high-end models to low-grade models with a small number of displays, and the board is designed with a small dead space.

According to a data transfer method for a fluorescent display tube driving device according to claim 16, in the system using the fluorescent display tube using the fluorescent display tube driving device and the microcomputer according to claims 1 to 15, the serial clock is high. In the state of the level, the timing when the serial data changes from the high level to the low level is used as a start condition to indicate the start of serial data transfer, and the serial data changes during the low level period of the serial clock terminal.
When the serial data is in the high level period, the fluorescent tube driving device takes in the data, and switches to the next data in the next low level period of the serial clock, and repeats this sequentially. However, after changing from a low level to a high level, a point at which the serial data line changes from a low level to a high level is used as a stop condition to recognize that serial data transfer has been completed.

According to a seventeenth aspect of the present invention, there is provided a data transfer system for a fluorescent display tube driving device according to the sixteenth aspect, wherein the serial data changes at the falling edge of the serial clock, and the serial data is captured by the fluorescent display tube driving device. The configuration is performed at the start.

A serial data transfer format for a fluorescent display tube driving device according to claim 18 is the system for using a fluorescent display tube driving device and a microcomputer using a fluorescent display tube according to claims 1 to 15. Conclusion By placing the check data of the transfer data, the fluorescent display tube driving device is configured to compare the transfer data with the transfer check data.

The serial data transfer format for a fluorescent display tube driving device according to the nineteenth aspect is the system for using the fluorescent display tube driving device and the microcomputer using the fluorescent display tube according to the first to fifteenth aspects. The check data for each predetermined number of bits is transferred after transferring the predetermined number of bits, and the transfer data for each number of bits determined on the fluorescent display tube driving device side and the transferred check By comparing the data with the data, normal transfer / abnormal transfer of the serial transfer data is identified, and the transfer is performed over the entire area of the transfer data.

The control method of the fluorescent display tube driving device according to the twentieth aspect is characterized in that in the system using the fluorescent display tube using the fluorescent display tube driving device and the microcomputer according to the first to fifteenth aspects, the first display data is displayed. While transferring
The output permission signal is at a low level, and after the first display data transfer is completed, the data is stored in the data register. At the same time as the output permission signal is raised, the first display data is output.
During this period, the data for the second display is transferred, and after the transfer is completed, the transfer data is stored in the data register, and the data for the second display is output only while the output permission signal for the second display is at the high level. By repeating a series of operations and further adjusting the high level period of the output permission signal, the configuration is made such that the luminance of the fluorescent display tube can be adjusted.

[0032]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing a fluorescent display tube driving device according to the first embodiment of the present invention. In FIG. 1, 101 is a serial clock input terminal, 102 is a serial data input terminal, 103 is an output enable input terminal, 10
4 is a shift register, 105 is a data register, 106
Is a high withstand voltage output port for grid, 107 is a high withstand voltage output port for anode, 108 is a grid drive terminal (digit output terminal), and 109 is an anode drive terminal (segment output terminal).

Data transferred in synchronization with the serial clock is sequentially stored in a shift register. When all the data has been transferred, the data is transferred from the shift register to the data register, and at the timing when the output enable signal goes to the high level, the high-voltage output terminals are set to the high level according to the transferred data.・ Low level is output. This corresponds to the high level period of DEG0 in FIG. Next, the data during the period when DEG1 is at the high level in FIG. 33 is transferred during the display period of DEG0, and the data is transferred to the high withstand voltage output port in the same manner as described above. Hereinafter, the above contents are repeated according to the display. According to the present invention, it is possible to provide a fluorescent display tube driving device which is advantageous in cost without increasing the chip size because the display RAM does not exist even if the display digits / display number increases. In addition, since both grid and anode data are transferred to serial data, even in systems using a fluorescent display tube compatible with universal grids, it is only necessary to send high-level information of two or more grid data to the transfer data. Is possible. Further, a control circuit of a display driving device (hereinafter, FL driver) can be minimized, and an FL driver which is advantageous in cost can be provided.

FIG. 2 is a circuit diagram of a fluorescent display driving apparatus according to a second embodiment of the present invention. In FIG. 2, 2
01 is a high withstand voltage output port, and 202 is a high withstand voltage output terminal.

According to the present invention, since the grids and the anodes have the same driving capability, the grid terminals and the anode terminals can be arbitrarily determined. In the configuration of FIG. 1, even if there is a surplus grid terminal, it cannot be used as a segment, so there was a possibility of creating a surplus terminal. However, a terminal not used as a grid output was used as an anode terminal. As a result, surplus terminals do not occur.

FIG. 3 is a circuit diagram of a fluorescent display tube driving device according to a third embodiment of the present invention. In FIG. 3, 3
01 is an AND circuit, 302 is a high withstand voltage p-type MOS transistor, and 303 is a power supply voltage.

By adopting the configuration shown in FIG. 3, a fluorescent display driving device can be easily constructed. Generally, DEG
The terminal / SEG terminal is pulled down to a low level by a high withstand voltage resistance when display is not performed. The same effect can be obtained by incorporating this high withstand voltage pull-down resistor, and further, the number of external components of the fluorescent display tube driving device can be reduced, and the price of the entire fluorescent display tube driving system can be reduced. Become.

FIG. 4 is a circuit diagram of a fluorescent display driving apparatus according to a fourth embodiment of the present invention. In FIG. 4, 4
01 is a synchronization signal input terminal, 402 is a control circuit, and 403 is a serial data output terminal.

If the fluorescent display driving device of the present invention is used,
If the number of display digits and the number of displays increase and the high withstand voltage output terminal of one fluorescent display tube driving device is not enough, it can be handled by connecting the fluorescent display tube driving device in a subordinate manner. The serial data output is connected to the serial data input terminal of the next stage fluorescent display tube driving device, and the serial clock is connected in parallel to the first stage and the next stage. By using the fluorescent display driving apparatus of the present invention, even if the display data increases, the fluorescent display driving apparatus can be replaced by one.
It is possible to easily cope with a large number of displays simply by increasing the number, and it is possible to cope without needing to newly increase the number of control terminals as in the related art.

FIG. 5 is a circuit diagram of a fluorescent display driving apparatus according to a fifth embodiment of the present invention. In FIG. 5, 5
01 is a transfer data determination circuit.

In the present invention, check data is added to the serial transfer data, and based on this data, the transfer data determination circuit determines whether there is any abnormality in the transfer data. In the check data, data for determining whether the total data of the transfer data is an odd number or an even number (for example, 1 for an odd number and 0 for an even number) is placed.
If the transfer data is normal, the transfer data is transferred to the data register. If the transfer data is abnormal, the transfer of the transfer data to the data register is stopped. According to the present invention, it is possible to prevent the fluorescent display tube from performing display based on erroneously transferred data.

FIG. 6 is a circuit diagram of a fluorescent display driving apparatus according to a sixth embodiment of the present invention. In FIG. 6, 5
Reference numeral 02 denotes a transfer data determination result output terminal (hereinafter, a PC terminal).

According to the present invention, if the transfer data is abnormal, the microcomputer outputs a high level to the transfer data judgment result output terminal, and outputs a low level if the transfer data is normal. Then, the success or failure of data transfer can be confirmed. Thus, if the transfer fails, the microcomputer transfers the same data again, and during that period, the fluorescent display tube driving device outputs the previous data. If the transfer fails, the microcomputer uses the information from the PC terminal to disable the output enable terminal (hereinafter referred to as the OE terminal) between the corresponding data that has been erroneously transferred, thereby enabling the erroneous data to be output. A configuration that does not display is also possible.

FIG. 7 is a circuit diagram of a fluorescent display driving apparatus according to a seventh embodiment of the present invention. In FIG. 7, 7
01 is a power supply voltage, 702 is a pull-up resistor, 703 is n
The type MOS transistor 704 is a power ground.

According to the configuration of FIG. 7, the OE terminal is controlled depending on whether the transfer data is correct or not. When the transfer data is normal, "L" is output as the data from the transfer data determination circuit, the output permission terminal is kept at "H", and the display data is output to the high withstand voltage output terminal. When the transfer data is abnormal, "H" is output as the data from the transfer data determination circuit, so that the output permission terminal is set to "L". Therefore, "L" is output to the high withstand voltage output terminal, and nothing is displayed on the fluorescent display tube. According to the configuration of the present invention, it is possible to determine the transfer state without increasing the number of terminals. Further, even when a plurality of FL drivers are connected in cascade, transfer data abnormality is determined even if transfer data of one FL driver is abnormal.

FIGS. 8 and 9 are circuit diagrams showing the configuration of a microcomputer for controlling a fluorescent display tube driving device (hereinafter abbreviated as a microcomputer) according to an eighth embodiment of the present invention.
8 and 9, 801 is a serial data input terminal, 802 is a serial data output terminal, 803 is a serial clock output terminal, 804 is an output enable signal output terminal,
805 is a storage device, 806 is a bus line, 807 is a shift register, 808 is a data latch, 809 is a CPU,
Reference numeral 810 denotes a fluorescent display tube driving device control circuit.

According to the present invention, data stored in the storage device is transferred to the shift register through the BUS line. The data transferred to the shift register is transferred from a serial data output terminal (hereinafter abbreviated as SDA terminal) in synchronization with a clock generated by the fluorescent display tube control circuit. Further, after the transfer is completed, an output permission signal is output from the fluorescent display tube control circuit. This allows
Display data is output from the FL driver through the high withstand voltage output terminal. As described above, according to the configuration of the present invention, control of the fluorescent display tube driving device can be easily realized only by adding a simple circuit to a conventional microcomputer. FIG.
Is a configuration in which the data register is deleted from FIG. 8, but even in this configuration, the above system can control the fluorescent display driving device without any trouble. further,
8 and 9, the BUS line and the CP for the storage device are used.
Although the BUS line for U is separately illustrated in the drawing, the same BUS line or another BUS line can be used to control the fluorescent display tube driving device without any problem.

FIG. 10 is a circuit diagram showing a configuration of a microcomputer for controlling a fluorescent display driving device according to a ninth embodiment of the present invention. In FIG. 10, reference numeral 901 denotes a DMA transfer control circuit.

According to the configuration of FIG. 10, the transfer data from the storage device is automatically transferred by the DMA transfer control device. In the configuration shown in FIG. 8, the transfer data is transferred in accordance with the instruction of the microcomputer, and as the transfer data amount increases, the ROM size of the microcomputer increases and the execution time becomes longer. In the present invention, the above deficiencies are improved, and the execution time of the microcomputer is significantly reduced. The microcomputer issues a transfer start instruction only once to the DMA transfer control circuit, and when the data transfer is completed from serial, the data is transferred from the storage device to the shift register via the BUS. As a result, the execution time of the microcomputer and the ROM size can be significantly reduced.

FIG. 11 is a circuit diagram showing a configuration of a microcomputer for controlling a fluorescent display tube driving device according to a tenth embodiment of the present invention. In FIG. 11, reference numeral 1001 denotes an automatic transfer data register.

According to the configuration of FIG. 11, if necessary data is previously transferred to the automatic transfer data register, the next data to be transferred is sent from the automatic transfer data register every time the serial data transfer is completed. Since the data is not loaded on the BUS line, the speed of the microcomputer can be increased.

FIGS. 12 and 13 are a circuit diagram and a timing diagram showing a configuration of a microcomputer for controlling a fluorescent display driving device according to an eleventh embodiment of the present invention. In FIG. 12, 1101 is a power supply voltage, 1102 is a pull-up resistor,
1103 is an n-type MOS transistor, 1104 is a power ground, and 1105 is an input buffer. 13, reference numeral 1106 denotes a serial transfer clock, 1107 denotes serial transfer data, 1108 denotes an output enable signal, 1109
Is a high voltage terminal output signal, 1110 is a blanking period,
1111 is a display period, 1112 is a data latch, 111
3 is an NMOS gate input signal.

In the configuration of the present invention, after serial transfer is performed, an "L" level signal is output from the fluorescent display tube control circuit to the gate of the n-type MOS transistor.
Thereby, the n-type MOS transistor is turned off,
The output permission terminal is pulled up to the power supply voltage level by a pull-up resistor. Here, if there is any abnormality in the data transferred to the FL driver, the FL driver
To output “L” to the E terminal, the OE terminal is pulled down to the “L” level. Therefore, if the OE terminal is observed after outputting "H" to the OE terminal, the microcomputer can determine whether or not there is an abnormality in the transfer of the serial data. In this case, the same effect can be obtained even if a transfer data correct / incorrect judgment terminal is provided separately without being shared with the OE terminal. As described above, the present invention provides a microcomputer for controlling a fluorescent display driving device, which can easily determine the correctness of serial transfer data.

FIG. 14 is a circuit diagram showing a configuration of a microcomputer for controlling a fluorescent display driving device according to a twelfth embodiment of the present invention. In FIG. 14, reference numeral 1201 denotes a pulse width modulation circuit (hereinafter abbreviated as a PWM circuit). According to the configuration of the present invention, the output period of the OE terminal can be easily changed by connecting the output of the PWM circuit to the OE output terminal. Generally, a fluorescent display tube has different brightness depending on the display color. For this reason, in order to make the fluorescent display tubes having different luminances have the same brightness, it is necessary to change the voltage application period. By using the microcomputer for controlling the fluorescent display tube driving device of the present invention, the brightness of the fluorescent display tube can be easily adjusted.

FIG. 15 is a system configuration diagram in which a microcomputer for controlling a fluorescent display tube driving device and one fluorescent display tube driving device according to a thirteenth embodiment of the present invention are connected. 15, 1301 is a microcomputer, 1302 is a FL driver (fluorescent display tube driving device), 1303 is a fluorescent display tube, 1304 is an output permission output terminal, 1305 is a clock output terminal, 1306 is a serial data output terminal, 1
307 is an output permission input terminal, 1308 is a serial clock input terminal, 1309 is a serial data input terminal, 13
Reference numeral 10 denotes a synchronization input terminal, and reference numeral 1311 denotes a serial data output terminal.

The output enable terminal of the microcomputer is connected to the output enable terminal of the FL driver, the clock output terminal of the microcomputer is connected to the clock input terminal of the FL driver, and the serial data output terminal of the microcomputer is connected to the serial data input terminal of the FL driver. Connected to the synchronization input terminal. According to the configuration of the present invention, a fluorescent display tube driving system can be configured with three pattern wirings, and the configuration of the set can be simplified.

FIG. 16 is a system configuration diagram in which a microcomputer for controlling a fluorescent display driving device and a plurality of fluorescent display driving devices according to a fourteenth embodiment of the present invention are connected. The microcomputer's output enable terminal is connected to the FL driver's output enable terminal, the microcomputer's clock output terminal is connected to the FL driver's clock input terminal, and the microcomputer's serial data output terminal is the FL driver's serial data input terminal and synchronous input terminal. The serial output terminal of the first stage FL driver is connected to the data input terminal of the next stage FL driver. According to the configuration of the present invention, the same 3
With this pattern wiring, a fluorescent display tube driving system having a larger number of displays can be constructed. For this reason, even if the number of displays further increases, it is possible to easily handle patterns. As described above, according to the present invention, it is possible to easily provide a system for a fluorescent display tube having a large number of displays.

FIG. 17, FIG. 18, and FIG. 19 are explanatory diagrams relating to the design of the fluorescent display tube driving system in the sixteenth embodiment of the present invention. 17, 1501 is a semiconductor package, 1502 is a semiconductor lead, 1503 is a 22-pin SO type, 1504 is a 24-pin SO type, 150
5 is a 28-pin SO type. In FIG. 18, 16
01 is a high withstand voltage output terminal (D0 to D19), 1602 is a high withstand voltage pull-down power supply terminal, 1604 is an output enable terminal, 1
603 is a power supply voltage terminal, 1605 is a serial data output terminal, 1606 is a serial data input terminal, 1607 is a serial clock input terminal, 1608 is a power supply ground terminal, 1609 is a synchronization signal input terminal, and 1610 is 22
A pin type terminal arrangement diagram, 1611 is a 28 pin type terminal arrangement diagram. In FIG. 19, 1612 is a fluorescent display tube driving device low pin version, 1613 is a fluorescent display tube driving device multi-pin version, 1614 is an FL driving terminal common to many pins and low pins, 1615 is an FL driving terminal added by a multi-pin, 16
Reference numeral 16 denotes a small display fluorescent display tube, and 1617 denotes a multiple display fluorescent display tube.

FIG. 17 shows an example of the semiconductor package. It can be seen that the lead pitch and the width of the semiconductor package do not change in the 22-pin SO, the 24-pin SO, and the 28-pin SO. Therefore, as shown in FIG. 18, the function terminals are shared between the 22-pin SO package and the 28-pin SO package. In FIG. 18, terminal numbers 4 to 11 of a 22-pin SO package are functional terminals. Reference numerals 1 to 3 and 12 to 22 are high breakdown voltage output terminals. Similarly, 28
The terminal numbers 4 to 11 of the pin SO package are functional terminals. Reference numerals 1 to 3 and 12 to 28 are high breakdown voltage output terminals. Such a 22-pin SO package and a 28-pin SO
By matching the positions of the functional terminals on both sides of the package,
With a smaller area, it is possible to use a single printed circuit board from high-end models with many displays to low-end models with few displays. FIG. 19 illustrates this. FIG.
In FIG. 9, it can be seen that the number of fluorescent display tube drive terminals is different between the small display version and the multiple display version, but the other terminals are common. Therefore, on the print board,
The circuit of the common part and the part where the small display and the multiple display do not match are written. At this time, the arrangement of the multi-display type fluorescent display tube driving device and the small display type fluorescent display tube driving device can be reduced so that the mounting area can be reduced. If it is a small display type model, it is sufficient to mount a fluorescent display tube driving device for small display, and if it is a multiple display type model, it is possible to mount a multiple display type fluorescent display tube driving device. Good. As a result, with a small mounting area,
It is possible to provide a fluorescent display tube driving system that can be realized with a single printed board, from a high-end model of a multi-display type to a low-end model of a small display type. In the figure, the case of the 28-pin SO type and the case of the 22-pin SO type have been described. However, other pin numbers and other package types can be similarly realized. Furthermore, since the fluorescent display tube driving device of the present invention can arbitrarily set the digit output terminal and the segment output terminal, it is not necessary to change the setting of the high withstand voltage driving terminal even if the number of pins changes, and the transfer data can be changed. You can respond with
As described above, according to the present invention, it is possible to provide a fluorescent display tube driving system that is smaller and can be shared.

FIGS. 20 and 21 are explanatory diagrams relating to the data transfer timing to the fluorescent display tube driving apparatus according to the sixteenth embodiment of the present invention. In FIGS. 20 and 21, 1701
Is a serial clock input signal, 1702 is a serial data input signal, 1703 is a start condition, 17
04 is a stop condition, 1705 is a serial data output signal, and 1706 is a synchronization input. In FIG. 20, the timing when the serial data changes from “H” to “L” during the period in which the serial clock is “H” is defined as a start condition. This notifies the FL driver of the start of data transfer. Next, the serial clock changes from “H” to “L”, and the serial data changes while the serial clock is “L”. Next, the data is determined at the timing when the serial clock changes from "H" to "L", and the data is taken into the fluorescent display tube. This is repeated for the required number of displays, and after all data transfer is completed, both the serial clock and serial data change to “L”, and the serial clock is changed to “L”.
Next, the serial data changes from “L” to “H” during the “H” period of the serial clock.
Is a stop condition. When this state occurs, the FL driver recognizes that the data transfer has been completed. By adopting such a transfer method of the present invention, the start and end of transfer can be recognized by a simple circuit, and the data stability of transfer data can be improved. Next, in FIG. 21, the timing at which the synchronous input changes from “H” to “L” during the “H” period of the serial clock and serial data input terminals is defined as a start condition. This notifies the FL driver of the start of data transfer. Sync input is “L”
During the period, data is transferred. After the transfer is completed, the timing at which the synchronization input changes from "L" to "H" is defined as a stop condition. Thus, the transfer end is FL
The driver is notified.

FIG. 22 is a timing chart for serial data transfer in the fluorescent display tube driving system according to the seventeenth embodiment of the present invention. In FIG. 22, the timing at which the serial data changes from "H" to "L" while the serial clock is at "H" is defined as a start condition. This notifies the FL driver of the start of data transfer. Next, the serial data changes at the timing when the serial clock changes from “H” to “L”. Next, the serial clock
The data is determined at the timing when it changes from "L" to "H", and the data is taken into the fluorescent display tube.This is repeated for the required number of displays, and after all data transfer is completed, the serial clock holds "H". , Serial data is “L”
Changes to Next, the timing at which the serial data changes from "L" to "H" while the serial clock is at "H" is defined as a stop condition. When this state occurs, the FL driver recognizes that the data transfer has been completed. By adopting such a transfer method of the present invention, the start and end of transfer can be recognized by a simple circuit, and the data stability of transfer data can be improved. further,
Data transfer is easily possible with existing microcomputers equipped with serial transmission.

FIGS. 23, 24 and 25 are explanatory diagrams of the transfer data format in the fluorescent display tube driving system according to the eighteenth embodiment of the present invention.

In FIGS. 23, 24 and 25, 200
1 is transfer data, and 2002 is total data.

The transfer data is transferred by an arbitrary number of bits corresponding to the number of displays on the fluorescent display tube. Check data is transferred next to the last bit after the transfer is completed. The check data is compared with the transferred data, and it is confirmed whether or not the transfer data has a transfer data abnormality due to noise or the like. There are the following methods for sending data as check data.
Data obtained by summing all the transfer data is transferred as check data. Data indicating whether the sum of all data is an odd number or an even number (for example, 1 for an odd number and 0 for an even number) is transferred as check data. In the transfer data, the number which is 1 is transferred as check data. In the transfer data, the number which is 0 is transferred as check data. According to the present invention, in data transfer of the fluorescent display tube driving system, it is possible to easily check serial data transfer, and prevent erroneous display of the fluorescent display tube from occurring.

FIGS. 26 to 30 are explanatory diagrams of a transfer data format in the fluorescent display tube driving system according to the nineteenth embodiment of the present invention. 26 to 30, 2201
Is transfer data of an arbitrary number of bits, and 2202 is sum data of an arbitrary number of bits.

The transfer data is transferred by an arbitrary number of bits out of the display number of the fluorescent display tube. After the transfer of an arbitrary number of bits is completed, check data of an arbitrary number of bits is transferred. Then, the check data is compared with the data transferred by an arbitrary number of bits, and it is confirmed whether the transfer data has a transfer data abnormality due to noise or the like. There are the following methods for sending data as check data. The sum of the arbitrary bit transfer data is transferred as check data. Data indicating whether data obtained by summing arbitrary bit data is odd or even (for example, 1 if odd, 0 if even)
To transfer. ) Is transferred as check data. In the transfer data, the number which is 1 is transferred as check data. In the transfer data, the number which is 0 is transferred as check data. According to the present invention, in data transfer of the fluorescent display tube driving system, it is possible to easily check serial data transfer, and prevent erroneous display of the fluorescent display tube from occurring. Further, according to the present invention, it is possible to increase the accuracy of the transfer data even if a coarse check is performed by the amount of subdivision of the number of bits.

FIG. 31 is an explanatory diagram showing display timing in the fluorescent display tube driving system according to the twentieth embodiment of the present invention. In FIG. 31, reference numeral 2701 denotes a serial transfer clock; 2702, serial transfer data;
03 is an output permission signal, 2704 is a high withstand voltage output signal, 27
05 is a blanking period, and 2706 is a display period.

In FIG. 31, first, the first data transfer for display is performed, and during this period, the output permission signal is at "L". Next, a blanking period for the first display occurs. This is to keep the high breakdown voltage terminal at "L" for a certain period in order to prevent leakage lighting of the fluorescent display tube. Next, the output permission signal becomes “H”, and the first display data is output from the high withstand voltage output terminal. The second display data is transferred during the first display. According to the present invention, the next display data can be transferred while the display data is output in this way, and a fluorescent display tube driving system can be constructed without using a useless circuit in the system.

[0070]

As described above, according to the fluorescent display driving apparatus according to the present invention, the following effects can be obtained.

According to the fluorescent display driving device of the first aspect, it is possible to provide an inexpensive fluorescent display driving device which can be configured with a smaller number of elements than the conventional one.

According to the fluorescent display tube driving device of the second aspect, the fluorescent display tube driving device can be configured with a smaller number of elements than in the prior art, and an inexpensive fluorescent display tube driving device can be provided. And digit terminals can be arbitrarily divided.

According to the fluorescent display tube driving device of the third aspect, the fluorescent display tube driving device can be configured with a smaller number of elements than in the past, an inexpensive fluorescent display tube driving device can be provided, and the high breakdown voltage terminal can be replaced with the segment terminal. And digit terminals can be arbitrarily divided.

According to the fluorescent display tube driving device of the fourth aspect, it is possible to provide an inexpensive fluorescent display tube driving device that can be configured with a smaller number of elements than in the past, and when the display number increases, the fluorescent display tube driving device can be provided. Can be connected subordinately,
It is possible to cope with the increase in the number of displays by connecting the present fluorescent display tube driving device without generating a new chip.

According to the fluorescent display tube driving device of the fifth aspect, it is possible to provide an inexpensive fluorescent display tube driving device which can be configured with a smaller number of elements than the conventional one. If the number of displays further increases, the fluorescent display tube driving device can be connected subordinately,
It is possible to cope with an increase in the number of displays without causing a new chip. Then, in the serial transfer data,
Transfer data abnormalities due to noise etc. can be detected,
False display can be prevented.

According to the fluorescent display driving device of the sixth aspect, it is possible to provide an inexpensive fluorescent display driving device which can be configured with a smaller number of elements than the conventional one. If the number of displays further increases, the fluorescent display tube driving device can be connected subordinately,
It is possible to cope with an increase in the number of displays without causing a new chip. Then, in the serial transfer data,
Transfer data abnormalities due to noise etc. can be detected,
False display can be prevented.

According to the fluorescent display driving apparatus of the seventh aspect, it is possible to provide an inexpensive fluorescent display driving apparatus which can be configured with a smaller number of elements than the conventional one. If the number of displays further increases, the fluorescent display tube driving device can be connected subordinately,
It is possible to cope with an increase in the number of displays without causing a new chip. Then, in the serial transfer data,
Transfer data abnormalities due to noise etc. can be detected,
False display can be prevented.

According to the fluorescent display tube driving device control microcomputer of the eighth aspect, the fluorescent display tube driving devices of the first to seventh aspects can be driven by a simple method.

According to the fluorescent display tube driving device control microcomputer of the ninth aspect, the fluorescent display tube driving devices of the first to seventh aspects can be driven by a simple method. Further, the automatic transfer of data enables data transfer to the fluorescent display tube driving device without increasing the number of instructions executed by the microcomputer.

According to the fluorescent display tube driving device control microcomputer of the tenth aspect, the fluorescent display tube driving devices of the first to seventh aspects can be driven by a simple method. Furthermore, by writing data once to the data automatic transfer register, data can be transferred to the fluorescent display driving device without increasing the number of instructions executed by the microcomputer.

According to the fluorescent display tube driving device control microcomputer of the present invention, the fluorescent display tube driving devices of the first to seventh aspects can be driven by a simple method. Furthermore, by writing data once to the data automatic transfer register, data can be transferred to the fluorescent display driving device without increasing the number of instructions executed by the microcomputer. Furthermore, on the fluorescent display tube side,
When a transfer data error occurs, it is possible to easily detect a data transfer abnormality by monitoring the output permission signal output terminal.

According to the fluorescent display tube driving device control microcomputer of the twelfth aspect, the fluorescent display tube driving devices of the first to seventh aspects can be driven by a simple method. Furthermore, by writing data once to the data automatic transfer register, data can be transferred to the fluorescent display driving device without increasing the number of instructions executed by the microcomputer. Further, by using the output of the PWM (frequency modulation circuit) for the output permission period of the fluorescent display tube driving device, the brightness can be easily increased or decreased only for an arbitrary period.

According to the fluorescent tube driving device system according to the thirteenth aspect, the fluorescent display tube driving device according to the first to seventh aspects,
By using the fluorescent display tubes according to claims 8 to 12 as a set, a fluorescent display tube driving system can be provided more easily and at a lower cost, and the noise generated from the fluorescent display tube driving device is taken care of. No, the system can be configured.

According to the fluorescent tube driving device system according to the thirteenth aspect, the fluorescent display tube driving device according to the first to seventh aspects,
By using the fluorescent display tubes according to claims 8 to 12 as a set, a fluorescent display tube driving system can be provided more easily and at a lower cost, and the noise generated from the fluorescent display tube driving device is taken care of. No, the system can be configured. Also, the microcomputer and the fluorescent display tube driving device can be configured independently, and even when the number of displays of the fluorescent display tube increases, it is only necessary to newly connect the same fluorescent display tube driving device, which is simple. Thus, a fluorescent display tube driving system can be configured.

According to the fluorescent display driving system of the fifteenth aspect, by preparing semiconductor packages having the same lead pitch and different numbers of pins and arranging common pins at the same position, the display number of the fluorescent display can be reduced. Even if it increases, it can be handled with a smaller set P plate area. Further, by incorporating the above contents into the P board in advance, it is possible to cope with the same set P board from high-end models to low-end models.

By using the fluorescent display tube driving data transfer system according to the present invention, data can be transferred without losing data. Therefore, the display of the fluorescent display tube is not erroneously displayed, and an excellent fluorescent display tube system is provided. Can be provided.

According to the fluorescent display tube driving data transfer method of the present invention, data can be transferred without losing data. Therefore, the display of the fluorescent display tube is not erroneously displayed, and an excellent fluorescent display tube system is provided. Can be provided.

According to the eighteenth aspect of the present invention, even if erroneous data is transferred to the transfer data for some reason, more than the transferred data can be detected. There is no mistake in the display,
A fluorescent display system can be provided.

According to the nineteenth aspect of the present invention, even if erroneous data is transferred to the transferred data for some reason, an abnormality in the transferred data can be detected. In addition, check data is inserted for each arbitrary bit, and even when data is transferred via a plurality of fluorescent display tube driving devices, abnormalities in transfer data can be detected by each fluorescent display tube driving device. . Therefore, it is possible to provide a fluorescent display tube system in which the display of the fluorescent display tube is not mistaken.

According to the fluorescent display tube driving operation timing of the twentieth aspect, during the n-th fluorescent display tube lighting, n +
It is possible to provide a fluorescent display tube driving system in which the first display data is transferred and the data can be transferred without waste on the system. Further, by making the permission period of the output permission signal variable, it is possible to easily change the luminance depending on the display, and it is possible to provide a fluorescent display tube driving system that can display more variously.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration of a fluorescent display tube driving device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a fluorescent display driving device according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a configuration of a fluorescent display tube driving device according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram showing a configuration of a fluorescent display tube driving device according to a fourth embodiment of the present invention.

FIG. 5 is a circuit diagram showing a configuration of a fluorescent display driving device according to a fifth embodiment of the present invention.

FIG. 6 is a circuit diagram showing a configuration of a fluorescent display driving device according to a sixth embodiment of the present invention.

FIG. 7 is a circuit diagram showing a configuration of a fluorescent display driving device according to a seventh embodiment of the present invention.

FIG. 8 is a circuit diagram showing a configuration of a microcomputer for controlling a fluorescent display tube driving device according to an eighth embodiment of the present invention.

FIG. 9 is a circuit diagram illustrating a configuration of a microcomputer that controls a fluorescent display driving device according to an eighth embodiment of the present invention.

FIG. 10 is a circuit diagram showing a configuration of a microcomputer that controls a fluorescent display tube driving device according to a ninth embodiment of the present invention.

FIG. 11 is a circuit diagram showing a configuration of a microcomputer for controlling a fluorescent display tube driving device according to a tenth embodiment of the present invention.

FIG. 12 is a circuit diagram illustrating a configuration of a microcomputer that controls a fluorescent display tube driving device according to an eleventh embodiment of the present invention.

FIG. 13 is a timing chart showing a configuration of a microcomputer for controlling the fluorescent display tube driving device according to the eleventh embodiment of the present invention.

FIG. 14 is a circuit diagram illustrating a configuration of a microcomputer that controls a fluorescent display tube driving device according to a twelfth embodiment of the present invention.

FIG. 15 is an explanatory view of a system equipped with a fluorescent display tube driving device and a microcomputer for controlling the fluorescent display tube driving device according to the thirteenth embodiment of the present invention.

FIG. 16 is an explanatory view of a system equipped with a fluorescent display tube driving device and a microcomputer for controlling the fluorescent display tube driving device in a fourteenth embodiment of the present invention.

FIG. 17 is an external view of a package for explaining a set board design using the fluorescent display tube driving device according to the fifteenth embodiment of the present invention.

FIG. 18 is a terminal arrangement diagram of a fluorescent display driving device for describing a set substrate design using the fluorescent display driving device in the fifteenth embodiment of the present invention.

FIG. 19 is a schematic diagram of a fluorescent display tube driving device system for describing a set substrate design using the fluorescent display tube driving device according to the fifteenth embodiment of the present invention.

FIG. 20 is a timing chart of serial data transfer to a fluorescent display tube driving device according to a sixteenth embodiment of the present invention.

FIG. 21 is a timing chart of serial data transfer to a fluorescent display tube driving device according to a sixteenth embodiment of the present invention.

FIG. 22 is a timing chart of serial data transfer to a fluorescent display tube driving device according to a seventeenth embodiment of the present invention.

FIG. 23 is an explanatory diagram of a serial data format 1 to the fluorescent display tube driving device according to the eighteenth embodiment of the present invention.

FIG. 24 is an explanatory diagram of a serial data format 2 to the fluorescent display tube driving device according to the eighteenth embodiment of the present invention.

FIG. 25 is an explanatory diagram of a serial data format 3 to the fluorescent display tube driving device according to the eighteenth embodiment of the present invention.

FIG. 26 is an explanatory diagram of a serial data format 1 to the fluorescent display tube driving device according to the nineteenth embodiment of the present invention.

FIG. 27 is an explanatory diagram of a serial data format 2 to the fluorescent display tube driving device according to the nineteenth embodiment of the present invention.

FIG. 28 is an explanatory diagram of a serial data format 3 for the fluorescent display tube driving device according to the nineteenth embodiment of the present invention.

FIG. 29 is an explanatory diagram of a serial data format 4 for the fluorescent display tube driving device according to the nineteenth embodiment of the present invention.

FIG. 30 is an explanatory diagram of a serial data format 5 for a fluorescent display tube driving device according to a nineteenth embodiment of the present invention.

FIG. 31 is an explanatory diagram of an operation timing chart of the fluorescent display tube driving device according to the twentieth embodiment of the present invention.

FIG. 32 is a diagram illustrating the configuration of a conventional fluorescent display tube driving device.

FIG. 33 is an explanatory diagram of a fluorescent display tube driving system and a timing chart.

FIG. 34 is an explanatory diagram 2 of a fluorescent display tube driving system and a timing chart.

[Explanation of symbols]

 Reference Signs List 101 serial clock input terminal 102 serial data input terminal 103 output enable input terminal 104 shift register 105 data register 106 high withstand voltage output port for grid 107 high withstand voltage output port for anode 108 grid drive terminal (digit output terminal) 109 anode drive terminal (segment Output terminal 201 High voltage output port 202 High voltage output terminal 301 AND circuit 302 High voltage p-type MOS transistor 303 Power supply voltage 401 Synchronization signal input terminal 402 Control circuit 403 Serial data output terminal 501 Transfer data judgment circuit 502 Transfer data judgment result Output terminal 701 Power supply voltage 702 Pull-up resistor 703 N-type MOS transistor 704 Power ground 801 Serial data input terminal 802 Serial data Data output terminal 803 serial clock output terminal 804 output enable signal output terminal 805 storage device 806 bus line 807 shift register 808 data latch 809 CPU 810 fluorescent display tube driving device control circuit 901 DMA transfer control circuit 1001 data register for automatic transfer 1101 power supply voltage 1102 pull-up resistor 1103 n-type MOS transistor 1104 power ground 1105 input buffer 1106 serial transfer clock 1107 serial transfer data 1108 output enable signal 1109 high voltage terminal output signal 1110 blanking period 1111 display period 1112 data latch 1113 NMOS gate input signal 1201 PWM Circuit 1301 Microcomputer 1302 FL driver (driving device for fluorescent display tube) 1303 Optical display tube 1304 Output permission output terminal 1305 Clock output terminal 1306 Serial data output terminal 1307 Output permission input terminal 1308 Serial clock input terminal 1309 Serial data input terminal 1310 Synchronization input terminal 1311 Serial data output terminal 1501 Semiconductor package 1502 Semiconductor lead 1503 22 pins SO type 1504 24-pin SO type 1505 28-pin SO type 1601 High withstand voltage output terminal (D0 to D19) 1602 High withstand voltage pull-down power supply terminal 1603 Power supply voltage terminal 1604 Output enable terminal 1605 Serial data output terminal 1606 Serial data input terminal 1607 Serial clock input Terminal 1608 Power ground terminal 1609 Synchronization signal input terminal 1610 22-pin type terminal arrangement 16 11 Terminal arrangement of 28-pin type 1612 Fluorescent display tube driving device low pin version 1613 Fluorescent display tube driving device multi-pin version 1614 Multi-pin low-pin common FL driving terminal 1615 FL driving terminal added with multi-pin 1616 Low-display fluorescent light Display tube 1617 Multiple display fluorescent display tube 1701 Serial clock input signal 1702 Serial data input signal 1703 Start condition 1704 Stop condition 1705 Serial data output signal 1706 Synchronization input 2001 Transfer data 2002 Total data 2201 Transfer data of arbitrary number of bits 2202 Arbitrary bit Total data 2701 Serial transfer clock 2702 Serial transfer data 2703 Output enable signal 2704 High withstand voltage output signal 2705 Blanking period 2706 Display period 2801 Light display tube driving device control circuit 2802 Display RAM 2901 Grid 2902 Anode 1 2903 Anode 2 2904 Digit 0 output signal 2905 Digit 1 output signal 2906 Digit 2 output signal 2907 Segment a to g output signal 2908 Segment output signal S1 2909 Segment output signal S2 2910 segment output signal S3

Claims (20)

[Claims] 1. A shift register for inputting a clock from a serial clock input terminal and inputting data from a serial data input terminal, a data register for storing data transferred to the shift register, and an output of the data register. A high withstand voltage output port for driving a fluorescent display tube grid and a high withstand voltage output port for driving a fluorescent display tube anode, and a DEG terminal for driving a fluorescent display tube anode; A fluorescent display tube driving device including an SEG terminal for driving a display tube grid, and capable of suppressing an increase in the chip size of a semiconductor chip for a fluorescent display tube driving device even when the number of displayed fluorescent display tubes increases. 2. A high-voltage output port for driving a grid of a fluorescent display tube and the high-voltage output port for driving an anode are configured as high-voltage output ports having the same capacity, so that grid / anode driving can be selected arbitrarily. 2. The fluorescent display driving device according to claim 1, wherein the terminals can be effectively used. 3. An AND circuit which receives the output of the data register as one input, receives the output of the output enable terminal as the other input, receives the output of the AND circuit as an input, and connects the output to the fluorescent display tube driving terminal. 3. The fluorescent display tube driving device according to claim 1, further comprising a high breakdown voltage transistor. 4. A synchronizing signal input terminal, a control circuit having an input signal from the synchronizing signal input terminal as one input and a serial clock as the other input, a shift register having a data output terminal, and 4. The control device according to claim 1, wherein the shift register and the data register are controlled by an output of the control circuit, so that the fluorescent display driving device can be connected in a dependent manner and serial data can be continuously transferred. The fluorescent display tube driving device as described in the above. 5. A transfer data discriminating circuit for discriminating whether the transferred data of the shift register is normal or abnormal is provided. If the transfer is normal, the data is transferred to the data register. If the transfer is abnormal, the data is transferred to the data register. The fluorescent display driving device according to any one of claims 1 to 4, wherein the data is not transferred and the previous data is retained. 6. The fluorescent display tube driving device according to claim 5, further comprising a circuit for determining whether the transferred data of the shift register is normal or abnormal, and outputting a determination result from a data transfer result determination terminal. 7. A transfer data determining circuit for determining whether the transferred data of the shift register is normal or abnormal, further connecting an output of an n-type MOS transistor to an output permission terminal, and inputting the input of the n-type MOS transistor. Is connected to an output of the transfer data determination circuit, and the output enable terminal is fixed to a power supply voltage level via a pull-up resistor. If the transfer data is normal, the output enable terminal is connected to a pull-up resistor. Fixed to the power level via
If the transfer data is abnormal, set the output enable terminal to n-type MOS.
The fluorescent display driving device according to any one of claims 1 to 6, having a configuration in which the ground level is fixed via the signal line and the output to the fluorescent display is not performed. 8. A data transfer device for transferring data from a storage device to a shift register via a bus line, wherein the shift register transfers data from a serial data transfer terminal in synchronization with a clock signal generated by a fluorescent display tube driving device control circuit. The microcomputer according to any one of claims 1 to 7, further comprising an output permission terminal for outputting a high voltage terminal output permission signal generated by the fluorescent display tube driving device control circuit. 9. The fluorescent display tube driving device according to claim 8, wherein the data transfer from the storage device to the shift register is performed using direct memory access, and the sequential data transfer control by the instruction of the microcomputer is unnecessary. Microcomputer. 10. The microcomputer for a fluorescent display driving device according to claim 8, further comprising an automatic transfer data register in place of the storage device, and eliminating the need for a microcomputer during serial automatic transfer. 11. An n-type MOS transistor is connected to an output permission signal terminal, further fixed at a power supply voltage level via a pull-up resistor, further input to a fluorescent display tube control circuit via an input buffer, and output permit terminal. The microcomputer for a fluorescent display tube driving device according to any one of claims 8 to 10, wherein the microcomputer can always monitor. 12. A pulse width modulation circuit for controlling an output permission signal can arbitrarily set a permission period of an output permission terminal.
The brightness of the fluorescent display tube can be set arbitrarily.
2. The microcomputer for a fluorescent display tube driving device according to claim 1. 13. A serial data terminal, a serial clock terminal, and an output enable terminal of any one of the fluorescent display tube driving devices according to claim 1 and any one of the semiconductor integrated circuits according to claim 9 to 12. A fluorescent display driving system in which a high-voltage output terminal of the fluorescent display driving device is connected to the fluorescent display. 14. The semiconductor integrated circuit according to claim 9, wherein two or more of the fluorescent display tube driving devices according to claim 1 are connected in parallel to increase the number of driving the fluorescent display tubes. One of the serial data terminal, the serial clock terminal, and the output permission terminal are connected to each other, and the high-voltage output terminal of the fluorescent display tube driving device is connected to the fluorescent display tube. Fluorescent display tube drive system that can respond even if display terminals are short due to increase. 15. A package having a small number of displays is selected by using a package having a small number of pins, and a package having a small number of pins is used. Select a small number of fluorescent display tube drive units, use a multi-pin package for a set with a large number of displays, and use the same pin arrangement for control signals such as serial clock, serial data, output control terminals, etc. By designing the pattern so that both the high-pin-count package and the low-pin-count package can be placed on top of each other in the set, the same set can be used from high-end models with many displays to low-end models with few displays. A set system that uses the same substrate and is equipped with a fluorescent display tube driving device that enables substrate design with a small dead space. Stem. 16. A system using a fluorescent display tube driving device and a fluorescent display tube using a microcomputer, wherein a start timing is a timing at which serial data changes from a high level to a low level while a serial clock is at a high level. Indicates the start of serial data transfer, the serial data changes while the serial clock terminal is at the low level, and the fluorescent display tube driving device captures data while the serial data is at the high level, during the low level period of the next serial clock. After the data transfer, the serial clock changes from low level to high level, and the serial data line changes from low level to high level. data A method of recognizing that the transfer has been completed, and a method of transferring data to a fluorescent display tube driving device characterized by a series of serial transfers. 17. The fluorescent display tube driving device according to claim 16, wherein the serial data changes at the falling edge of the serial clock, and the serial data can be captured by the fluorescent display driving device at the rising edge. Data transfer method. 18. In a system using a fluorescent display tube driving device and a fluorescent display tube using a microcomputer, check data of transfer data is placed at the end of transfer serial data, so that the transfer data is transmitted on the fluorescent display tube driving device side. A serial data transfer format of a fluorescent display driving device that makes it possible to distinguish between normal transfer and abnormal transfer of serial transfer data by comparing the transfer check data with the transfer check data. 19. In a system using a fluorescent display tube driving apparatus and a fluorescent display tube using a microcomputer, check data for each predetermined number of bits of transfer serial data is transferred at the predetermined number of bits. Later, by comparing the transfer data for each number of bits determined by the fluorescent display tube driving device with the transferred check data, normal transfer / abnormal transfer of serial transfer data is identified. A transfer format of the fluorescent display tube driving device, which enables the transfer data to be transmitted over the entirety of the transmission data and improves the accuracy of the transferred data even in a system in which a plurality of fluorescent display tube driving devices are connected in series. 20. In a system using a fluorescent display tube using a fluorescent display tube driving device and a microcomputer, the output permission signal is at a low level during the first display data transfer, and the first display data transfer is not performed. After the completion, the data is stored in the data register, and at the same time as the output permission signal is raised, the first display data is output. During this period, the second display data is transferred. By repeating the series of operations of outputting the data of the second display only during the period when the output permission signal of the second display is at the high level, and further adjusting the high level period of the output permission signal, A control method of fluorescent display tube driving measures that enables display tube brightness adjustment.