JPS54120547A - Microprogram memory controller - Google Patents
Microprogram memory controllerInfo
- Publication number
- JPS54120547A JPS54120547A JP2766878A JP2766878A JPS54120547A JP S54120547 A JPS54120547 A JP S54120547A JP 2766878 A JP2766878 A JP 2766878A JP 2766878 A JP2766878 A JP 2766878A JP S54120547 A JPS54120547 A JP S54120547A
- Authority
- JP
- Japan
- Prior art keywords
- microinstruction
- return
- program
- counter
- stored
- 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 make it possible to use one part of a microprogram from any other program as a subroutine, by providing a counter which can be stored with any value by a microinstruction and a FF which is set by a microinstruction.
CONSTITUTION: This controller is equipped with counter 34 which can be stored with one part of the contents of an instruction register through the assignment of a microinstruction and counts down by one at every time when one microinstruction is executed, FF35 which is set by a microinstruction and then reset when the contents of return-address standby register 30 are moved into microprogram counter MPC21, and AND circuit 39. When it is required to return to the original point again during the execution of one part of a program with no return instruction, the number of instructions to be executed until the return to the original program is set to counter 34 firstly, FF35 is set secondary, and then, the output of adder 27 is stored as the return address in register 30 while the contents of MPC21 are substituted with the head address of the program stored in instruction register 24, so that the branch to the head address of an aimed program will be attained.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2766878A JPS54120547A (en) | 1978-03-13 | 1978-03-13 | Microprogram memory controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2766878A JPS54120547A (en) | 1978-03-13 | 1978-03-13 | Microprogram memory controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54120547A true JPS54120547A (en) | 1979-09-19 |
Family
ID=12227318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2766878A Pending JPS54120547A (en) | 1978-03-13 | 1978-03-13 | Microprogram memory controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54120547A (en) |
-
1978
- 1978-03-13 JP JP2766878A patent/JPS54120547A/en active Pending
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