JPS5657147A - Program counter circuit - Google Patents
Program counter circuitInfo
- Publication number
- JPS5657147A JPS5657147A JP13280579A JP13280579A JPS5657147A JP S5657147 A JPS5657147 A JP S5657147A JP 13280579 A JP13280579 A JP 13280579A JP 13280579 A JP13280579 A JP 13280579A JP S5657147 A JPS5657147 A JP S5657147A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- terminal
- signal
- case
- output
- 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 reduce the count delay time and make various program branching possible, by constituting the program counter circuit with an adder circuit and a latch circuit.
CONSTITUTION: In case of instructions other than the jump instruction and the skip instruction, "L", "H" and "L" are given to signal input terminals 25, 23 and 24 respectively. In this case, the code signal which is obtained by adding 1 to the output of adder circuit 28 is obtained, and selecting circuit 29 selects the output of circuit 28 and supplies it to latch circuit 21. Consequently, when the clock pulse is supplied to terminal 22, the code signal of output signal terminal 27 is increased by +1. Next, in case of the skip instruction, circuit 28 transfers the code signal increased by 2 to circuit 29 because terminals 25, 23 and 24 become "H", "H" and "L" respectively. Consequently, the output of circuit 28 is supplied to circuit 21, and the code signal incerased by 2 is obtained at terminal 27. Next, in case of the jump instruction, terminals 23 and 24 become "L" and "H" respectively, and circuit 29 selects the signal of signal input terminal 26 to supply it to circuit 21. Consequently, the address code of the jump destination given to terminal 26 is obtained at terminal 27.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13280579A JPS5657147A (en) | 1979-10-17 | 1979-10-17 | Program counter circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13280579A JPS5657147A (en) | 1979-10-17 | 1979-10-17 | Program counter circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5657147A true JPS5657147A (en) | 1981-05-19 |
Family
ID=15089982
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13280579A Pending JPS5657147A (en) | 1979-10-17 | 1979-10-17 | Program counter circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5657147A (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49103548A (en) * | 1973-02-05 | 1974-10-01 | ||
JPS51124342A (en) * | 1975-04-23 | 1976-10-29 | Toshiba Corp | Information processing unit |
JPS5227332A (en) * | 1975-08-27 | 1977-03-01 | Hitachi Ltd | Information processor |
JPS5267538A (en) * | 1975-12-03 | 1977-06-04 | Hitachi Ltd | Address designation method |
JPS5275144A (en) * | 1975-12-18 | 1977-06-23 | Omron Tateisi Electronics Co | Program control device |
-
1979
- 1979-10-17 JP JP13280579A patent/JPS5657147A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49103548A (en) * | 1973-02-05 | 1974-10-01 | ||
JPS51124342A (en) * | 1975-04-23 | 1976-10-29 | Toshiba Corp | Information processing unit |
JPS5227332A (en) * | 1975-08-27 | 1977-03-01 | Hitachi Ltd | Information processor |
JPS5267538A (en) * | 1975-12-03 | 1977-06-04 | Hitachi Ltd | Address designation method |
JPS5275144A (en) * | 1975-12-18 | 1977-06-23 | Omron Tateisi Electronics Co | Program control device |
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