JPS57212546A - Controlling system for electronic computer - Google Patents

Controlling system for electronic computer

Info

Publication number
JPS57212546A
JPS57212546A JP56098797A JP9879781A JPS57212546A JP S57212546 A JPS57212546 A JP S57212546A JP 56098797 A JP56098797 A JP 56098797A JP 9879781 A JP9879781 A JP 9879781A JP S57212546 A JPS57212546 A JP S57212546A
Authority
JP
Japan
Prior art keywords
instruction
branch
signal line
branch instruction
fetched
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
JP56098797A
Other languages
Japanese (ja)
Inventor
Junji Kitamura
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56098797A priority Critical patent/JPS57212546A/en
Publication of JPS57212546A publication Critical patent/JPS57212546A/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
    • G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
    • G06F9/30003—Arrangements for executing specific machine instructions
    • G06F9/3005—Arrangements for executing specific machine instructions to perform operations for flow control
    • G06F9/30058—Conditional branch instructions

Landscapes

  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Advance Control (AREA)
  • Executing Machine-Instructions (AREA)

Abstract

PURPOSE:To execute a conditional branch instruction in a high speed, by using a means, where information indicating that branch conditions are satisfied is stored, and two clock lines to skip fetch operations for rest words of the conditional branch instruction when branch is unnecessary. CONSTITUTION:When a branch instruction signal line 10 from an instruction decoder 4 becomes ''1'', the value of a program counter 1 is counted up to (N+2) by the signal of a clock signal line CLK2 and the ''0''-side output of a flip- flop 13, and the second word of a branch instruction is fetched in an instruction register 3. If branch conditions are not satisfied, the value of the program counter 1 is counted up to (N+3) by the signal of a clock signal line CLK1 and the ''0''-side output of the flip-flop 13, and the first word including the next operation code (OP code 2) is fetched from an ROM and is set to the instruction register 3.
JP56098797A 1981-06-25 1981-06-25 Controlling system for electronic computer Pending JPS57212546A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56098797A JPS57212546A (en) 1981-06-25 1981-06-25 Controlling system for electronic computer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56098797A JPS57212546A (en) 1981-06-25 1981-06-25 Controlling system for electronic computer

Publications (1)

Publication Number Publication Date
JPS57212546A true JPS57212546A (en) 1982-12-27

Family

ID=14229341

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56098797A Pending JPS57212546A (en) 1981-06-25 1981-06-25 Controlling system for electronic computer

Country Status (1)

Country Link
JP (1) JPS57212546A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5541558A (en) * 1978-09-19 1980-03-24 Toshiba Corp Micro program control system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5541558A (en) * 1978-09-19 1980-03-24 Toshiba Corp Micro program control system

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