JPH0334115B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electronic device equipped with a recording device. More specifically, the present invention is an electronic device equipped with a recording device configured to be connectable to an external memory such as a ROM (read only memory) for character generation.

[Prior art]

Conventionally, ROM for character generation (hereinafter referred to as CG
Some electronic devices with removable external memory (not limited to ROM) have a lock mechanism that prevents the external memory from being removed while the external memory is being accessed. Also,
There is a known configuration in which a buffer is provided between the external memory and the electronic device to electrically disconnect the electronic device and the external memory when the external memory is removed, and then the removal is performed. ing. These configurations are effective and necessary for devices that require high reliability or for which high cost is not an issue.

However, in cases where providing such protection means significantly increases the overall cost of the electronic device, or when installing or removing external memory, serious problems such as destruction of the electronic device may occur. If there is no such device, or if it is clearly considered a user error to attach or remove external memory while the electronic device is in operation,
There is no need to intentionally provide the above-mentioned protection measures.

For example, when considering an electronic typewriter, which is a type of electronic device, the external memory, or CG ROM package, is used during printing, and when you try to attach or remove this CG ROM package,
If the printing pattern is cut off in the middle, or if a CG ROM package different from the one you removed is inserted even if it is possible to temporarily stop printing when it is inserted or removed (for example, if a CG ROM package with a different character pitch is inserted) etc.), problems occur when reprinting. Further, the attachment and detachment of the CG ROM package causes noise to be superimposed on the bus line, causing many problems such as CPU malfunction.

〔the purpose〕

In view of the above-mentioned points, an object of the present invention is to provide an electronic device that performs appropriate internal processing or response even when an external memory is attached or detached during a recording operation.

In order to achieve such an object, the present invention includes a printing means, an external storage means that is detachable from the device main body, a connecting means for connecting the external storage device to the device main body, and the external storage device. a detecting means for detecting that the means is removed from the connecting means; and a detecting means for detecting that the external storage means is removed from the device main body during a printing operation of the printing means; and control means for resetting the device body.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an electronic typewriter to which the present invention is applied. In this figure, 1 is a microprocessor that functions as a CPU (Central Processing Unit), which reads a program from ROM 2 (described later) and performs calculations and operations according to the program.
After making a judgment, RAM 3, keyboard 4, which will be described later,
It controls the printer 5, latch circuit 6, and CG ROM package 9, and prints and edits documents.

The ROM2 is a read-only memory in which a program for operating the CPU1 is written.
The RAM 3 is a read/write memory for temporarily storing calculation result data during the operation of the CPU 1. The keyboard 4 is an input means of this device,
Input various data for printing/editing documents.

The CPU 1 reads a dot pattern from the CG ROM based on data input from the keyboard 4, and the printer 5 prints out the dot pattern. Also,
A latch circuit 6 latches the contents of a flag indicating the status of the printer 5. A connector 7 is a connector for connecting the CG ROM package 9 to the main body of the apparatus. 8 is a switch for determining the package connection of the CG ROM 9. CG of this device
As shown in Figure 2, the ROM package insertion part has a structure with a lid, and the CG ROM9
When the lid 20 is opened to attach or detach the switch 8, the switch 8 is turned on.

The CG ROM package 9 is a packaged ROM that stores dot patterns for printing. Reference numeral 10 denotes a one-shot multivibrator, which outputs a pulse of a constant width only once to the signal line S6 in response to a rising edge of the signal line S5. Reference numeral 11 denotes a power-on reset control circuit, which is activated in conjunction with the power switch when the power is turned on.

S1 is a bus line, which is a group of signal lines for the CPU 1 to control each of the above-mentioned components 2 to 7. S2 is a signal line indicating the state of a flag set during printer operation. In other words, CPU1
causes the latch circuit 6 to latch a logic level "1" only while the printer is operating, and to latch a logic level "0" at other times, thereby causing a signal to be sent to the signal line S2.

S3 is a signal line that sends a signal indicating the open/closed state of the lid 20 in the second illustration. In this embodiment, when installing or removing the CG ROM package 9, it is necessary to open the lid shown in the second figure.

12 is a display device for displaying data from the keyboard, calculation results of the CPU 1, etc.

In this embodiment, the connector 7 has a CG ROM.
The package 9 is connected, and the CPU 1 uses the key input data entered from the keyboard.
The dot pattern is read from the CG ROM and the printer 5 is controlled to execute printing. At this time,
A logic level "1" is written in the latch circuit 6, and the logic level of the signal line S2 is "1". Also, as mentioned above, when printing is not in progress,
The credit line S2 is set to "0".

Currently, no printing is being done (i.e.
CG ROM is not in use), and
Assume that you are keying in a document using only display 12. At this time, when the lid 20 is opened to install or remove the CG ROM, the switch 8 turns "ON" and the logic level "1" is applied to the signal line S3.
signal appears. However, since the signal line S2 is at the "0" level at this time, the AND gate G1
The output signal line S4 remains at the "0" level. Therefore, the one-shot multivibrator 10 is not activated and is not reset.

Signal line S3 is the control terminal CTL of CPU1
The switch 8 detects that the switch 8 is turned ON, and the CPU 1 is connected to the
to the hold state (temporarily stops operation). After the CG ROM package 9 has been installed and removed, the lid 20 is closed and the switch 8 is turned OFF.
CPU1 returns to the operating state again.

On the other hand, while printing is in progress and the signal line S2 is at the "1" level, the lid 20 is opened to install or remove the CG ROM package 9, and the switch 8 is turned "ON", which causes the signal line S3 to be turned on. Through
At the same time as the CPU 1 temporarily stops its operation, the levels of the signal lines S4 and S5 change to start (set) the one-shot multivibrator 10. Therefore, a one-shot pulse is sent to the signal line S6, and the CPU 1 enters the reset state. After this, close the lid 20 and turn the switch 8 "OFF"
When this happens, the CPU 1 returns to the operating state and runs the initialization routine. In other words, by closing the lid 20, the present embodiment is set to the same state as when the power switch is turned on.

FIG. 4 is a schematic flowchart showing the control procedure of this embodiment described above.

In step S1, the open/closed state of the lid 20 is detected (the level of the signal line S3 is checked), and if it is determined that the lid 20 has been opened, a flag is set in step S2 (the signal line S2 is set to "1"). ”
to do).

Then, in step S3, the operation of this embodiment is temporarily stopped.

If it is determined in step S4 that the lid 20 is closed again, the entire device is initialized in step S5.

In this manner, when the CG ROM package 9 is attached or detached during printing, the CPU 1 is requested to temporarily stop, and then a reset is applied, thereby achieving the same state as when the power switch is turned on. Also, even when printing is not in progress,
When installing or removing the CG ROM package, the CPU is temporarily stopped to prevent noise from being superimposed on the bus line S1 and causing the device to malfunction.

In this embodiment, the installation/removal status of the external memory is detected by opening/closing the lid 20, but the installation/removal of the external memory may be detected by other methods, for example, by blocking light. Of course, it is possible to apply methods such as the following.

〔effect〕

As explained above, according to the present invention, CG
If an external memory such as a ROM package is inserted or removed during printing, the entire device can be returned to the state it was in when the power was turned on (i.e., the initial state), which eliminates various inconveniences that may occur if the printing operation is stopped in the middle of printing. can be avoided. At the same time, it is possible to hint to the user that the CG ROM package or the like must not be attached or detached during printing.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a diagram explaining the installed state of the character generation ROM package, FIG. 3 is a diagram explaining the level change of the signal line S3 shown in FIG. 1, and FIG. 4 is a flowchart showing the control procedure of this embodiment. It's a chat. 1...CPU, 2...ROM, 3...RAM, 4
...Keyboard, 5...Printer, 6...Latch circuit, 7...Connector, 8...Switch, 9...
ROM package for character generation, 10... one-shot multivibrator, 11... power-on reset control circuit, S1 to S6... signal line, G1... AND gate, 20... lid.

Claims (1)

[Scope of Claims] 1. Printing means; External storage means detachable from the device body; Connection means for connecting the external storage means to the device body; The external storage means is connected to the connection means. detecting means for detecting that the external storage means has been removed from the device body; and resetting the device body when the detection means detects that the external storage means has been removed from the device body during a printing operation of the printing device; An electronic device comprising a control means. 2. The electronic device according to claim 1, wherein the control means resets the main body of the device after stopping the printing operation of the printing means.