JPS6459442A - Start signal output system in microprocessor - Google Patents

Start signal output system in microprocessor

Info

Publication number
JPS6459442A
JPS6459442A JP62216657A JP21665787A JPS6459442A JP S6459442 A JPS6459442 A JP S6459442A JP 62216657 A JP62216657 A JP 62216657A JP 21665787 A JP21665787 A JP 21665787A JP S6459442 A JPS6459442 A JP S6459442A
Authority
JP
Japan
Prior art keywords
external device
start signal
busy
signal
outputted
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
JP62216657A
Other languages
Japanese (ja)
Inventor
Takashi Sugiyama
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP62216657A priority Critical patent/JPS6459442A/en
Publication of JPS6459442A publication Critical patent/JPS6459442A/en
Pending legal-status Critical Current

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  • Microcomputers (AREA)

Abstract

PURPOSE:To prevent a start signal from being outputted in a busy state by generating a start signal output request to generate the start signal in a microprocessor independently of the state of an external device and controlling the output of this start signal to the external device in accordance with a busy signal by a gate circuit. CONSTITUTION:When it is necessary to output the start signal to the external device, a flip flop 21 is set unconditionally without checking the busy status of the external device. The Q output signal of the flip flop 21 is not outputted as a start signal START to the external device as it is but is outputted to the external device in accordance with a busy signal BUSY by the output control of an AND gate 23. Thus, the start signal START is prevented from being outputted to the external device when the external device is in the busy state.
JP62216657A 1987-08-31 1987-08-31 Start signal output system in microprocessor Pending JPS6459442A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62216657A JPS6459442A (en) 1987-08-31 1987-08-31 Start signal output system in microprocessor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62216657A JPS6459442A (en) 1987-08-31 1987-08-31 Start signal output system in microprocessor

Publications (1)

Publication Number Publication Date
JPS6459442A true JPS6459442A (en) 1989-03-07

Family

ID=16691890

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62216657A Pending JPS6459442A (en) 1987-08-31 1987-08-31 Start signal output system in microprocessor

Country Status (1)

Country Link
JP (1) JPS6459442A (en)

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