JPS641032A - Microcomputer circuit - Google Patents
Microcomputer circuitInfo
- Publication number
- JPS641032A JPS641032A JP15550887A JP15550887A JPS641032A JP S641032 A JPS641032 A JP S641032A JP 15550887 A JP15550887 A JP 15550887A JP 15550887 A JP15550887 A JP 15550887A JP S641032 A JPS641032 A JP S641032A
- Authority
- JP
- Japan
- Prior art keywords
- value
- cpu
- subroutine
- circuit
- executes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Executing Machine-Instructions (AREA)
Abstract
PURPOSE: To read out a subroutine corresponding to a written value by writing the value, which corresponds to the subroutine to be read, in a register circuit before a call instruction.
CONSTITUTION: Lower and upper addresses of subroutines are arranged in subroutine lower and upper address ROMs 6 and 7. First, a CPU 1 writes the accumulator value in a register circuit 5 by an instruction OUT or the like. At this time, a call instruction control circuit 3 is started to start monitor of the instruction code which the CPU 1 executes, and the CPU 1 executes the program written in a program storage ROM 8. The circuit 3 detects that the CPU 1 reads in the instruction code of the call instruction, and the value designated by the circuit 5 is read out from the ROM, and the value similarly designated is read out from the ROM 7. The CPU 1 executes the subroutine corresponding to the value of the accumulator.
COPYRIGHT: (C)1989,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15550887A JPS641032A (en) | 1987-06-24 | 1987-06-24 | Microcomputer circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15550887A JPS641032A (en) | 1987-06-24 | 1987-06-24 | Microcomputer circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH011032A JPH011032A (en) | 1989-01-05 |
JPS641032A true JPS641032A (en) | 1989-01-05 |
Family
ID=15607581
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15550887A Pending JPS641032A (en) | 1987-06-24 | 1987-06-24 | Microcomputer circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS641032A (en) |
-
1987
- 1987-06-24 JP JP15550887A patent/JPS641032A/en active Pending
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