JPS5563439A - Instruction control system for direct data bit - Google Patents
Instruction control system for direct data bitInfo
- Publication number
- JPS5563439A JPS5563439A JP13713878A JP13713878A JPS5563439A JP S5563439 A JPS5563439 A JP S5563439A JP 13713878 A JP13713878 A JP 13713878A JP 13713878 A JP13713878 A JP 13713878A JP S5563439 A JPS5563439 A JP S5563439A
- Authority
- JP
- Japan
- Prior art keywords
- instruction
- rom
- instructions
- data
- data bit
- 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 use the decoder with efficiency so that the instructions of two types are incorporated into one instruction to reduce the number of instructions decoded and the resulting instruction can be used for another instruction being decode outputted.
CONSTITUTION: The microcomputer includes the program counter 1, stack register 2, address control section 3, and ROM 4, the instruction read out from ROM is inputted to the latch circuit 3 and it is held for one step. The output is fed to the decoder 6 and various instructions are decoded and outputted. The gate circuits 7W10 selects either one of the direct data bit stored in ROM and the contents of the register 16 and it is derived to the data bus 11 in 4 bits. Further, the logic operation circuit 12 makes logical operation with the contents of the accumulator 13 and the data derived on the data bus 11 and stores the result in the accumulator 13. RAM 14 stores various data.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13713878A JPS5563439A (en) | 1978-11-06 | 1978-11-06 | Instruction control system for direct data bit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13713878A JPS5563439A (en) | 1978-11-06 | 1978-11-06 | Instruction control system for direct data bit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5563439A true JPS5563439A (en) | 1980-05-13 |
Family
ID=15191701
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13713878A Pending JPS5563439A (en) | 1978-11-06 | 1978-11-06 | Instruction control system for direct data bit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5563439A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61216027A (en) * | 1985-02-14 | 1986-09-25 | Fujitsu Ltd | Microprogram processing system |
JPH0250222A (en) * | 1988-08-11 | 1990-02-20 | Nec Corp | Operand supplying system |
-
1978
- 1978-11-06 JP JP13713878A patent/JPS5563439A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61216027A (en) * | 1985-02-14 | 1986-09-25 | Fujitsu Ltd | Microprogram processing system |
JPH0250222A (en) * | 1988-08-11 | 1990-02-20 | Nec Corp | Operand supplying system |
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