JPS5657147A - Program counter circuit - Google Patents

Program counter circuit

Info

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
Application number
JP13280579A
Other languages
Japanese (ja)
Inventor
Hirohisa Nikukura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oki Electric Industry Co Ltd
Original Assignee
Oki Electric Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Oki Electric Industry Co Ltd filed Critical Oki Electric Industry Co Ltd
Priority to JP13280579A priority Critical patent/JPS5657147A/en
Publication of JPS5657147A publication Critical patent/JPS5657147A/en
Pending legal-status Critical Current

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
JP13280579A 1979-10-17 1979-10-17 Program counter circuit Pending JPS5657147A (en)

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)

* Cited by examiner, † Cited by third party
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
JPS56104529A (en) Flip-flop circuit
JPS5657147A (en) Program counter circuit
JPS5550734A (en) Programmable delay integrated circuit element
JPS5299031A (en) Three value input detecting circuit
JPS5720864A (en) Vector processor
JPS5239156A (en) High voltage generating circuit
JPS5429534A (en) Adding system of optional functions to composite terminal
JPS5373047A (en) Generation circuit for timing signal
JPS5567803A (en) Programmable control circuit
JPS5378743A (en) Multiplier
JPS5685127A (en) Digital signal processor
JPS55123238A (en) Power supply system of logic circuit
JPS54101254A (en) Relay control circuit
JPS5423573A (en) Electronic watch
JPS53129952A (en) Load driving circuit
JPS5217732A (en) Integrated circuit unit
JPS54545A (en) Output circuit of electronic control unit
JPS5447976A (en) Logic arithmetic unit
JPS5373048A (en) Generation circuit for timing signal
JPS57101948A (en) Execution time controlling circuit of instruction
JPS5286758A (en) High accurate digital delay circuit
JPS57118425A (en) Digital pattern generating circuit
JPS54154237A (en) Preference selection system
JPS5235954A (en) Self-operation confirming circuit
JPS52142552A (en) Digital electronic timepiece