JPH04172547A - Data storage device with data protective function - Google Patents

Abstract

PURPOSE:To obtain a data storage device with data protective function by transferring some that should be preserved by storage out of data that are in store in a volatile storage means to an electrically reloadable non-volatile storage means when replacing the battery with a new one. CONSTITUTION:When a slide switch SW5 is slid as far as an off position in order to replace battery E with a new one, CPU 1a detects that battery E is to be replaced and carries out a received data saving processing. First, the CPU 1a sends a signal Y to a DC-DC converter 6, and sets a voltage to be supplied to E<2>PROM 5 at 5V that is necessary for writing. Further, a clock signal is sent RTOM5 to specify a leading address for saving area, followed by sending a writing command signal to ROM 5 to make it writable. Furthermore, of received data units stored in RAM 1c, those to which a protect flag have been set up are read out and synchronized with the clock signal, followed by transferring them to ROM 5, further followed by sequentially storing them in a saving area.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a data storage device with data protection functions.

[Prior Art and its Problems] Conventional data storage devices with a data protection function include those equipped with a battery exclusively for memory retention, or those equipped with a large-capacity backup capacitor.

However, with this type of device, if you replace the power supply battery without realizing that the memory retention battery has reached the end of its lifespan and is no longer able to retain memory, you may lose valuable stored data. In addition, the backup capacitor can only maintain memory for a limited time, and the time margin when replacing the battery is not sufficiently satisfactory.

[Object of the invention] The present invention has been made in view of the above circumstances, and
The purpose of the present invention is to provide a data storage device with a data protection function that can maintain complete memory when replacing batteries or the like.

[Summary of the Invention J In order to achieve the above-mentioned object, the present invention provides a non-volatile storage means that can electrically rewrite data to be stored and retained among the data stored in the volatile storage means when replacing the battery. The gist is that the information is transferred to and stored in the computer.

[Embodiment] The present invention will be specifically described below based on an embodiment shown in the drawings. In this embodiment, the present invention is applied to a data storage device of a paging receiver with a message data receiving function.

FIG. 1 is a diagram showing the circuit configuration of a paging receiver. That is, the configuration is centered around a one-chip microcomputer 1 with a built-in decoder including a CPU 1a, a decoder lb, and a RAM 1c, and other circuit sections are connected to this. The radio section 3 is a circuit that demodulates the FM signal received by the antenna 2, and the waveform shaping section 4 is a circuit section that shapes the waveform of the signal wave demodulated and sent from the radio section 3.

E2 FROM 5 connects to the one-chip microcomputer l with built-in decoder etc. via connectors 5a, 5b, and 5c.
Also, in the E2 FROM connected to the DC-DC converter 6 via the connector 5d, there is a self-address data storage area that stores the address data assigned to the paging receiver (the address data cannot be written to this area). The decoder 1b is synchronized with the clock signal from the decoder 1b, and has a save data storage area for storing the predetermined data of the RAM 1c when it is transferred. sends the above address data to decoder ib, and CPU1
This is a circuit unit that exchanges the above-mentioned predetermined data with CPola in synchronization with a clock signal from a.

The DC-DC converter 6 converts the voltage from the power supply battery E into CP
Switch to the voltage according to the signal from U1a and E2 FRO
This is a circuit section that applies to M5. That is, E2 FROM5
When reading received data stored in the CPU 1a
In response to the signal
This circuit receives the signal Y sent from the CPUIJL when writing the reception data to the ROM5, converts the voltage from the power supply battery E to 5V, and supplies it to the E2 P110M5.

The decoder 1b receives the signal from the CPU 1a and decodes E2F.
The clock signal is sent to the ROM 5 to fetch the address data stored in the E2FROM, and thereafter, power is intermittently supplied to the wireless section 3 and the waveform shaping section 4 at each transmission timing to the self, and the data is sent from the waveform shaping section 4. received signals.

Decode it based on the captured address data, and if it is sent to yourself, send it to the CP.
This is the circuit that sends it to U1a.

CPola is a circuit unit that sends signals to each circuit unit according to the open/close states of various switches and controls them.

The RAM 1c is a circuit section that stores received data etc. sent from the CPU 1a. The RAMlc is also provided with an area in which a protect flag is set if the received data that has been sent requires storage protection.

The battery cover opening/closing detection switch sw is a switch that is turned on when the lid of the storage section of the power source battery E is opened, and turned off when the lid is closed. The reset switch SW2 is used to stop the sound from the speaker 8 or to
The 0 display switch SW3, which is a switch operated to stop displaying received data on the CD 9, is a switch operated when sequentially displaying received data stored in the RAM 1c on the LCD 9. The protect switch SW4 is a switch that is operated when the received data requires storage protection, to set a protect flag indicating this in the flag area of the storage section of the RAM 1c of the data. Slide switch SWs
has contacts PI, P2 connected to the CPU 1a and a contact P3 grounded, and these are selectively connected depending on the sliding position. In addition, the slide switch SW
The sound position where contacts PI and P2 of s are connected to contact P3 is selected when setting the sound mode to generate a reception sound when there is a reception, and connects only contact P2 to contact P3.
The silent position connected to 3 is selected to set the silent mode in which the above-mentioned reception sound is not generated even if there is a reception,
The off position, in which neither contact P+ nor P2 is connected to contact P3, is selected when stopping power supply from power supply battery E to each circuit section, which will be described later.

The speaker driver 7 receives the signal from the CPU 1a,
This is a circuit section that drives the speaker 8 to generate received sound and the like. The LCD 9 is a circuit section that receives signals from the CPU 1a and displays received data and the like.

Further, the power supply battery E is a power supply battery that supplies power to each circuit section.

Next, the operation of the non-embodiment configured as described above will be explained.

For example, it is assumed that a large amount of received data that has already been received is stored in the RAM 1c, some of which should be protected, and the protect flag has been set. Here, when you slide the slide switch SW5 to the above-mentioned off position to replace the power battery E, or when you open the lid of the storage compartment for the power battery E (note that when you slide the slide switch SW5 to the off position) The same thing will happen when you open the above lid later)
U1a is connected to the power supply because the signal level applied via contacts P, P2 is no longer the ground level, or the battery cover opening/closing detection switch SWI is turned on and the signal level applied via it becomes the ground level. It is detected that the battery E is replaced, and the following received data saving process is executed. That is, first, a signal Y is sent to the DC-DC converter 6 to set the power supply voltage supplied to the E2 FROM 5 to 5V necessary for writing, and then a clock signal is sent to the E2 FROM 5 to specify the start address of the save area. , sends a write command signal to the E2FROM5, and sets the E2FROM5 to a writable state. After that, among the received data stored in the RAM 1c, the data with the protect flag set is read out,
The received data is transferred to the E2 FROM 5 in synchronization with the clock signal and sequentially stored in the save area.

As described above, the received data that should be protected is E2.
After being written to the save area of FROM5, even if the power supply battery E is removed and the power supply to each circuit is stopped, the memory of this E2 FROM5 will not be erased, so sufficient memory retention will be ensured. will be possible.

In addition, after replacing the power battery E as described above, when the lid of the storage compartment of the power battery E is closed and the battery lid opening/closing detection switch SW+ is turned off, or when the slide switch SWs is turned to the sound position or When the silent position is set, the level of the signal sent via the battery cover opening/closing detection switch SWI is no longer the ground level, or the signal sent via at least one of the contacts PI and P2. Since the level of has become the ground level, the CPU 1a detects that battery replacement etc. have been completed, and executes the following processing. That is, 5 First, DC
- Send signal X to DC converter 6, E2 FROM5
1.5V when reading the power supply voltage supplied to the ! -L,
Next, a start signal is given to the CPU 1a4* and the decoder lb to read the self-address data from the E2 FROM 5 and store it, and then proceed to the process for establishing synchronization with the received radio waves.

Further, when the above storage process in the decoder 1b is completed, the CPU 1a sends a clock signal to the E2 PROM 5, serially reads the received data saved in the save register, and transfers it to the RAM 1c for storage.

Next, other embodiments of the present invention will be described. Figure 2 shows the circuit configuration of this embodiment, which is generally the same as the circuit configuration of the previous embodiment (in Figure 2, the same reference numerals as in Figure 1 have the same functions), but the following: They differ in some respects. In the above-described embodiment, the E2 PflOM5 was configured to store self-address data and received data that requires memory protection, but in this embodiment, the ROM (ID-ROMI O&)k storage ms stores self-address data.
ROM (E2
FROMI Ob) is a separate structure. In addition, mode changeover switches S and Wm, which were not provided in the above-mentioned embodiments, are provided, so that in addition to the normal mode for displaying received data on the LCD 9, telephone number data etc. can be displayed on the LCD 9. It is possible to select the telephone number mode for displaying, the telephone number writing mode for writing the telephone number data, etc.

When configured as in this embodiment, E2 FROMlo
There is no need to store self-address data in b, so E
2. Data input/output to/from FROMI Ob can be performed in parallel, not serially, but in units of 4 bits, etc., and by extension, writing and reading areas can be specified by addresses.

Note that this invention is not limited to the embodiments described above, and can be modified and applied in various ways without departing from the scope of the invention. Only the received data is sent to E2.
It was intended to be saved to FROM, but E2 FRO
Of course, the capacity of the save area in M may be made equal to the capacity of the received message storage area in the RAM, so that all received data can be saved.

[Effects of the Invention] As detailed above, the present invention transfers the data stored in the volatile storage means to the electrically rewritable nonvolatile storage means when replacing the battery. Since this relates to a data storage device with a data protection function that stores data using
It is possible to provide a data storage device with a data protection function that can maintain complete storage.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a circuit configuration of one embodiment of the invention, and FIG. 2 is a diagram showing a circuit configuration of another embodiment of the invention. l...One-chip microcontroller with built-in decoder, etc. 2...Antenna, 3...Radio section, 4.
...Waveform shaping section, 5, iob...E2
FROM, 6...DC-DC converter, 7.
...Speaker driver, 8 ...Speaker, 9 ...LCD, 10a ... ID-f
lOM, la...CPU, 1b...decoder, lc...RAM, SW+...
Battery cover opening/closing detection switch, SW2...Reset switch, SW3...Display switch, SWs...
...Protect switch, SWs...Slide switch, SWm...Mode changeover switch. Patent applicant Casio Computer Co., Ltd.

Claims (3)

[Claims] (1) A power supply battery that supplies power to each circuit section, a power switch used to instruct on/off of power supply from the power supply battery to each circuit section, an input means for inputting data, and the input means random-access volatile storage means for storing data input by the user; and electrically rewritable non-volatile storage means for storing data transferred from the volatile storage means; when the power switch is operated, When power supply from the power source battery is started, predetermined data stored in the non-volatile storage means is transferred to and stored in the volatile storage means, and on the other hand, when the power switch is operated, the power source battery 1. A data storage device with a data protection function, comprising: control means for transferring and storing data in said volatile storage means to said nonvolatile storage when power supply from said volatile storage means is stopped. (2) A data storage device with a data protection function as set forth in claim (1), characterized in that the power switch is replaced by a switch for detecting opening/closing of a lid of the battery compartment. (3) In the data storage device with a data protection function according to claim (1) or (2), the input means is a wireless receiver that receives transmitted radio waves. Storage device.