JPS57133715A - Clock oscillator - Google Patents

Clock oscillator

Info

Publication number
JPS57133715A
JPS57133715A JP56019220A JP1922081A JPS57133715A JP S57133715 A JPS57133715 A JP S57133715A JP 56019220 A JP56019220 A JP 56019220A JP 1922081 A JP1922081 A JP 1922081A JP S57133715 A JPS57133715 A JP S57133715A
Authority
JP
Japan
Prior art keywords
mos
oscillation frequency
oscillation
resistor
capacitor
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
JP56019220A
Other languages
Japanese (ja)
Inventor
Takao Jinriyou
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP56019220A priority Critical patent/JPS57133715A/en
Publication of JPS57133715A publication Critical patent/JPS57133715A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/353—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of field-effect transistors with internal or external positive feedback
    • H03K3/354—Astable circuits

Abstract

PURPOSE:To change oscillation frequency at an arbitrary time, by an execution program of a microcomputer system. CONSTITUTION:When an output 40 of an oscillation frequency control FF21 is at high level, an N-MOS TR18 is conductive. Thus, at the oscillation of a CMOS oscillation circuit, a capacitor 11 is charged through a P-MOS TR14, discharged through a resistor 13 and N-MOS TRs 16, 17, 18 and then the oscillation frequency is controlled. Next, when the output 40 of the FF21 is changed to a low level, the N-MOS TR18 is non-conductive. With this state, the capacitor 11 of the CMOS oscillation circuit is made through the resistor 13 and the N-MOS TR16. Set input signal I1 and reset input signal I2 for an oscillation frequency control FF21 are generated with the clock alteration instruction of a microcomputer system.
JP56019220A 1981-02-12 1981-02-12 Clock oscillator Pending JPS57133715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56019220A JPS57133715A (en) 1981-02-12 1981-02-12 Clock oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56019220A JPS57133715A (en) 1981-02-12 1981-02-12 Clock oscillator

Publications (1)

Publication Number Publication Date
JPS57133715A true JPS57133715A (en) 1982-08-18

Family

ID=11993278

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56019220A Pending JPS57133715A (en) 1981-02-12 1981-02-12 Clock oscillator

Country Status (1)

Country Link
JP (1) JPS57133715A (en)

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