JPS5629749A - Microprogram control device - Google Patents
Microprogram control deviceInfo
- Publication number
- JPS5629749A JPS5629749A JP10578579A JP10578579A JPS5629749A JP S5629749 A JPS5629749 A JP S5629749A JP 10578579 A JP10578579 A JP 10578579A JP 10578579 A JP10578579 A JP 10578579A JP S5629749 A JPS5629749 A JP S5629749A
- Authority
- JP
- Japan
- Prior art keywords
- instruction
- rwm
- rom
- signal
- satisfied
- 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
Abstract
PURPOSE: To realize an effective application of the memory, by reading the microprogram μPG instruction out of the ROM side and then using the data at the RWM side respectively in case the PG is read out for the address overlapped to the ROM and the rewritable memory RWM.
CONSTITUTION: The output of 16 bits supplied from the address register 1 is supplied to the ROM/RWM selection signal generating circuit 3 as well as to the ROM5 and RWM6 of the memory part 4. The circuit 3 generates the ROM/RWM selection signal 10 by the detection signal which detects whether the several bits of the address have satisfied the specified conditions plus the signal 9 under reading the μ instruction and supplied from the timing control part 2. When the specified conditions are satisfied with reading the μ instruction, the μ instruction is fetched from the ROM5 and by the signal 10. And in case the specified conditions are satisfied but no μ instruction is being read, the read/write of the data is carried out to the RWM6 by the signal 10. And when the specified conditions are not satisfied, the read/write of the data and the μ instruction is carried out to the RWM6 by the signal 10. As a result, the unused region can be eliminated for both the ROM and RWM with more reduced quantity of the hardware.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10578579A JPS5629749A (en) | 1979-08-20 | 1979-08-20 | Microprogram control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10578579A JPS5629749A (en) | 1979-08-20 | 1979-08-20 | Microprogram control device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5629749A true JPS5629749A (en) | 1981-03-25 |
Family
ID=14416787
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10578579A Pending JPS5629749A (en) | 1979-08-20 | 1979-08-20 | Microprogram control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5629749A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS513538A (en) * | 1974-06-27 | 1976-01-13 | Tokyo Shibaura Electric Co | |
JPS5126424A (en) * | 1974-08-29 | 1976-03-04 | Tokyo Shibaura Electric Co | KIOKUSEIGYO SOCHI |
JPS5222449A (en) * | 1975-08-13 | 1977-02-19 | Hitachi Ltd | Microprocessor |
-
1979
- 1979-08-20 JP JP10578579A patent/JPS5629749A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS513538A (en) * | 1974-06-27 | 1976-01-13 | Tokyo Shibaura Electric Co | |
JPS5126424A (en) * | 1974-08-29 | 1976-03-04 | Tokyo Shibaura Electric Co | KIOKUSEIGYO SOCHI |
JPS5222449A (en) * | 1975-08-13 | 1977-02-19 | Hitachi Ltd | Microprocessor |
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