JPS56159736A - Microprogram control circuit - Google Patents

Microprogram control circuit

Info

Publication number
JPS56159736A
JPS56159736A JP6253080A JP6253080A JPS56159736A JP S56159736 A JPS56159736 A JP S56159736A JP 6253080 A JP6253080 A JP 6253080A JP 6253080 A JP6253080 A JP 6253080A JP S56159736 A JPS56159736 A JP S56159736A
Authority
JP
Japan
Prior art keywords
circuit
clock
program
oscillator
longer
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
JP6253080A
Other languages
Japanese (ja)
Inventor
Yoichi Wakai
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP6253080A priority Critical patent/JPS56159736A/en
Priority to GB8110281A priority patent/GB2075729B/en
Priority to US06/262,358 priority patent/US4408328A/en
Priority to CH307881A priority patent/CH644462A5/en
Publication of JPS56159736A publication Critical patent/JPS56159736A/en
Priority to HK731/86A priority patent/HK73186A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/22—Microcontrol or microprogram arrangements
    • G06F9/26—Address formation of the next micro-instruction ; Microprogram storage or retrieval arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Debugging And Monitoring (AREA)

Abstract

PURPOSE:To bring a routine forcibly back to the initial state by operating a circuit system for a given period of time or longer, by providing a microprogram control circuit which operates the system with an external or internal start signal and enters into a system halt state with a specific microinstruction. CONSTITUTION:A clock signal operation various electric circuits is generated by an oscillator using quartz, etc., and a frequency divider 301 and the clock is supplied to a main circuit 302. The circuit 302 is provided with an ROM304 stored with various instructions and an RAM307 stored with various data. A timer circuit 334 receiving outputs from a timer 315, input port 314 and oscillator and frequency divider 301 and the clock is provided with logical circuits, such as an OR gate controlling the stop and start of the system, latch 319, FF circuit 325, etc. When the clock is supplied to the circuit 302 for a set time or longer, an address assigned by a program counter 303 is regarded as the starting address of an initializing program to prevent a runaway of a program.
JP6253080A 1980-05-12 1980-05-12 Microprogram control circuit Pending JPS56159736A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP6253080A JPS56159736A (en) 1980-05-12 1980-05-12 Microprogram control circuit
GB8110281A GB2075729B (en) 1980-05-12 1981-04-01 Microprogramm control circuit
US06/262,358 US4408328A (en) 1980-05-12 1981-05-11 Microprogram control circuit
CH307881A CH644462A5 (en) 1980-05-12 1981-05-12 CIRCUITRY FOR THE EXECUTION OF A MICRO-PROGRAM.
HK731/86A HK73186A (en) 1980-05-12 1986-10-02 Microprogram control circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6253080A JPS56159736A (en) 1980-05-12 1980-05-12 Microprogram control circuit

Publications (1)

Publication Number Publication Date
JPS56159736A true JPS56159736A (en) 1981-12-09

Family

ID=13202837

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6253080A Pending JPS56159736A (en) 1980-05-12 1980-05-12 Microprogram control circuit

Country Status (1)

Country Link
JP (1) JPS56159736A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5242040A (en) * 1975-09-29 1977-04-01 Hitachi Ltd Microprogram control unit
JPS5474644A (en) * 1977-11-28 1979-06-14 Nec Corp Control system of microprogram

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5242040A (en) * 1975-09-29 1977-04-01 Hitachi Ltd Microprogram control unit
JPS5474644A (en) * 1977-11-28 1979-06-14 Nec Corp Control system of microprogram

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