JPS6146867B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a program status display method in a small electronic calculator with a program.

A small electronic calculator with a program can store multiple programs in its memory, but a program number (or program label) is added to the beginning of each program to distinguish the storage area of each program. There is. Therefore, when writing a program, it is generally up to the operator to decide which program number to use. Therefore, when switching to write mode, clearly indicate the program number to be used at the end.
This prevents new programs from being written to the programmed program number. However, some of the programs stored in the area indicated by the used program number are highly important and are protected by adding a password or the like. However, in the conventional display method, even though it is possible to distinguish between unused program numbers and used program numbers, it is not displayed whether the used program number is a used program number that is protected by program. This may cause inconvenience in use, such as clearing expensive programs.

This invention was made in view of the above points,
To provide a program status display method that displays an unused program number, a protected program number, and an unprotected program number in different formats when switching to a write mode.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 1, 11 is a key input section,
It is equipped with a numeric keypad 12, a function key 13 for writing programs, a MODE key 14 for specifying a mode such as a write mode, and an EXE key 15 for instructing program execution.
The key input data from the key input section 11 is sent to the CPU
(central processing unit) 20, and is sent to the address section (not shown) in the control section 20 by this address section.
1 addressing is performed. In addition to signals input from the key input section 11, the address section includes a carry signal of a program counter 22, a program number detection section 23, and a password detection section 24, which will be described later.
A detection signal of is given as address data.
The control unit 21 is configured using, for example, a ROM (read-only memory), stores various microprograms, and has an output line a for specifying the row address of the RAM (random access memory) 25, and a column address of the RAM 25. It is provided with an output line b for specifying a code signal and a code signal output line c to perform various control operations. The row address output from the output line a of the control section 21 is sent directly to the RAM 25, and the column address output from the output line b is set to the address counter 26, and the count contents are sent to the RAM 25. After the first column address data is set, the address counter 26 can sequentially count up in accordance with a timing signal to advance the column address of the RAM 25 to a designated digit. The RAM 25 is composed of various operation registers such as an X register and a Y register, and a register is designated by a row address, and a digit of the designated register is designated by a column address. The data read from the RAM 25 is input to the calculation section 27, program number detection section 23, and password detection section 24, respectively. In addition, the calculation section 27, the program number detection section 23, and the password detection section 24 include the control section 2.
A code signal output from one output line c is respectively given. The calculation unit 27 performs calculations on input data, and the calculation results are stored in the RAM 2.
Sent to 5. The program number detection section 23 detects the program number of a program stored in an external RAM 28, which will be described later, and its detection signal is sent to the address section as described above.
Further, the password detection unit 24 detects whether a password is added to the program stored in the RAM 28 and designated as protection.
The detection signal is sent to the address section as described above. Further, the control section 21 sends a +1 signal and a -1 signal to the program counter 22, as well as a reset signal. This program counter 22 is a counter that specifies the address of an external RAM 28 for program storage provided outside the CPU 20. External RAM28 has CPU20
Data read from RAM 25 in the memory is input. In addition, the output data of external RAM28 is
It is sent to RAM25 in 0. Further, an external ROM 29 for storing constants is provided outside the CPU 20. This external ROM 29 contains constant data such as "π" as well as predetermined data such as program number data "9, 8, 7, 6, 5, 4, 3, 2,
1, 0, P" and is addressed by a code signal output from the output line c of the control section 21. The constants read from this RAM 29 are sent to the RAM 25 within the CPU 20. The X register in the RAM 25 serves both as an arithmetic register and a display register, and its stored contents are displayed on the display section 30.

FIG. 2 shows details of the X register and Y register within the RAM 25. X register and Y
The register consists of 16 digits, the 0th digit is a flag digit, and the 1st digit is a flag digit.
The ~15th digit is the data storage digit. Therefore, when displaying unused program numbers,
The program number read from the external ROM 29 is written in the 1st to 15th digits of the register. That is,
A program number of "9-0" is written in the 5th to 14th digits of the X register, and "P" indicating a program is written in the 15th digit. In addition, the Y register has a mode flag indicating the write mode in the 0th digit, a program number of the external RAM 28 that is addressed by the program counter 22 in the 10th and 11th digits, and a program number in the external RAM 28 in the 12th and 13th digits. is external RAM28
password will be written.

FIG. 3 shows the state of program storage in the external RAM 28, where a program number is written at the beginning of each program. The external RAM 28 has, for example, a two-digit configuration with addresses from "000" to "255",
It can store 10 programs from P ₀ to P ₉ . In this case, the program number is "0" ~
"9" is used, a "0" is omitted in the upper digits, and the program number is displayed according to the contents of the lower digits. Therefore, data other than "0" in the upper digit, or even if the upper digit is "0", the lower digit is "0" ~
If data other than "9" is written, it indicates the content of the program. In addition, when protecting a program, a password is written in the 8-digit area after the program number (from the next address to the 4th address of the program number), and the password is written in the next 2-digit area (from the program number to the 4th address). At the fifth address), "12" and "14" are written as "*" (asterisk) codes indicating whether a password has been added to the program. In this example, a password is added only to program _P2 .

Next, the operation of the present invention configured as described above will be explained. When writing a program,
First, the MODE key 14 of the key input section 11 is operated to switch to the write mode. When the above MODE key 14 is operated, the operation signal is sent to the CPU 20.
This address field specifies the address of the control section 21, and the unused program number display process shown in FIG. 4 is performed. First, from the output line c of the control unit 21 to the external ROM 2
A code signal specifying address 9 is output,
All program numbers “P, 0,
1, 2, 3, 4, 5, 6, 7, 8, 9, B _L , B
_"L , B _L , B _L " are read out, and step S in FIG.
and is written to the 1st to 15th digits of the X register as shown in FIG. 5A. Note that " _BL " in the above program number is a blanking code. Also, as mentioned above, by entering the write mode, the fifth
As shown in FIG. A, "1" indicating the write mode is written in the flag digit of the Y register. Next, the program proceeds to step _S2 in FIG. 4, where a reset signal is sent from the control section 21 to the program counter 22, and the program counter 22 is reset. Then step
As shown in _S3 , the address of the external RAM 28 is designated by the contents of the program counter 22, and the stored contents are read out to the 10th and 11th digits of the Y register. For example, if the external RAM 28 stores the program shown in FIG. P ₀ ) is in the Y register
Read in 10th and 11th digits. Then steps S ₄ , S ₅
As shown in FIG. 2, the program number detection unit 23 determines whether the data is a program number. That is, in step _S4 , it is determined whether the contents of the 11th digit of the Y register is "0" or not.
If it is “0”, proceed to step _S5 and register Y.
Determine whether the content of the 10th digit is greater than "9". If the content of the 10th digit of the Y register is "9" or less, the process advances to step _S6 , where the control section 21 outputs five +1 signals to the program counter 22, and the program counter 22 is set to "5". Next, in step _S7 , the address of the external RAM 28 is designated by the contents of the program counter 22, and the stored contents "34" are read out to the 12th and 13th digits of the Y register. Thereafter, as shown in steps _S8 and _S9 , the password detection section 24 determines whether the data is a "*" code. That is, in step _S8 , it is determined whether the content of the 12th digit of the Y register is "14" or not. If it is "14", the process proceeds to step _S9 , and the content of the 13th digit of the Y register is "12".
Determine whether or not. If the content of the 13th digit of the Y register is "12", the "*" code is (14) of the X register.
-The contents of the 10th digit of the Y register) are written to the 1st digit. On the other hand, if the determination result in step _S8 or _S9 is NO, the process advances to step _S11 , where five -1 signals are sent from the control section 21 to the program counter 22, and the contents are set to "-5". . Then, in step _S12 , A _L (underline)
The code is entered in the (14 - content of the 10th digit of the Y register Y ₁₀ ) digit of the X register. In the above case, since "4" is stored in the 12th digit of the Y register, "NO" is determined in step _S8 . Therefore, in step _S11 , the contents of the program counter 22 are incremented by -5, and the program counter 22 is set to "0". Then, in step _S12 , the content "0" of the 10th digit of the Y register is subtracted from "14" by the arithmetic unit 27, and the subtraction result "14" is transferred to the address counter 26, and the fifth
As shown in Figure B, an A _L (underline) code is input into the corresponding X register digit. If the process in step _S10 or _S12 is completed, or if the determination result in step _S4 is "NO",
If the content of the _Y10 digit is greater than "9" in step _S5 , the program proceeds to step _S13 , where a +1 signal is given from the control section 21 to the program counter 22, the count content is increased by "+1", and as a result, the program counter 22 is incremented by "+1". It is determined whether a signal is generated. i.e. external
It is determined whether all reading of the RAM 28 has been completed. If there is no carry signal at step _S13 and all reading from the external RAM 28 has not been completed, the process returns to step _S3 and the stored contents for the next address of the external RAM 28 specified by the program counter 22 are read as shown in FIG. Read out the 10th and 11th digits of the Y register as shown in C. At this time external
The content read from RAM28 to the Y register is "61", indicating the content of program P ₀ , so
The program jumps from step _S4 to step _S13 , increments the program counter 22 by 1, and returns to step _S3 again. Thereafter, the same process is repeated, and as _shown in _{FIG .} After that, the process advances to step _S6 , where the contents of the program counter 22 are incremented by 5, and
As a result, "26" is set in the program counter 22. Then, proceed to step _S7 and load external RAM 2.
``1214'' stored at address ``26'' of 8 is read out to the 12th and 13th digits of the Y register. Thereafter, the process proceeds to step S ₁₀ via steps S ₈ and S ₉ , where the content "2" in the 10th digit of the Y register is subtracted from "14", and the subtraction result "12" is transferred to the address counter 26 and is stored in the address counter 26. As shown in Figure 5E, the "*" code is input into the corresponding X register digit. The same process is repeated, and as shown in FIG. 5F, the next stored program number "07" (P ₇ ) is transferred to the external RAM
8 to the Y register, steps S ₄ ,
Proceed to step S ₆ via S ₅ and program counter 2
2 is incremented by 5, and the data in the external RAM 28 addressed by the contents of the program counter 22 becomes Y.
The 12th and 13th digits of the register are read, but the step
The determination is "NO" in _S8 . And step S ₁₁
After that, in step _S12 , the content "7" of the 10th digit of the Y register is subtracted from "14", and the subtraction result "7" is transferred to the address counter 26.
As shown in FIG. 5F, an A _L (underline) code is input into the corresponding X register digit. Similarly, the program number “04” (P ₄ ) or “09” stored in the external RAM 28
(P ₉ ) is also underlined as shown in FIG. 5G or H. In this way the external
The memory contents of the RAM 28 are checked, and when the process reaches the final address "255", a carry occurs in step _S13 , and the process proceeds to step _S14 . In this step _S14 , the contents of the X register are sent to the display section 30 and displayed on the display section 30 as shown in FIG. That is, among all the program numbers initially set in the
“7” and “9” are underlined and external
Program number already written in RAM28 and password added, "2" in the above example
“*” is displayed on the display unit 30, and unused program numbers “1, 3, 5, 6, 8” are displayed on the display unit 30.

As detailed above, according to the present invention, it is possible to clearly indicate the program number currently in use and protected, the program number currently in use and not protected, and the unused program number when writing a program. Therefore, it can be confirmed at a glance that the program is of high importance, and a warning can be given to prevent the program from being damaged due to erroneous operation. Furthermore, when clearing a program, it can be confirmed at a glance that the program is of high importance, and a warning can be given to prevent the program from being cleared due to erroneous operation or the like.

Furthermore, it is possible to easily determine whether or not a password must be entered when modifying or reading a program, which has the advantage of being extremely convenient for operation.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the configuration of the RAM in the CPU in FIG. 1, FIG. 3 is a diagram showing the program storage state of the RAM, and FIG. The figure is a flowchart showing the operation contents, and Figures 5A to 5A show each register, program counter, and external RAM in each processing step.
FIG. 3 is a diagram showing the contents and display state of 11...Key input section, 14...MODE key,
20...CPU, 21...Control unit, 22...Program counter, 23...Program number detection unit, 24...Password detection unit, 25...
RAM, 28...external RAM, 29...external
ROM, 30...display section.

Claims (1)

[Claims] 1. In a small electronic computer with a program, there is a program storage means for sequentially storing input program information, and a first program storage means for sequentially reading out the memory contents stored in this storage means to detect a program number that has already been written. and this first detection means.
a second detecting means for detecting whether or not a program corresponding to the used program number detected by the detecting means is designated as protected;
and a control means for displaying the protected program number, the non-protected program number, and the unused program number detected by the detection means and the second detection means in different formats. Features a program status display method.