JPH0377113A - External oscillation circuit - Google Patents

External oscillation circuit

Info

Publication number
JPH0377113A
JPH0377113A JP1213684A JP21368489A JPH0377113A JP H0377113 A JPH0377113 A JP H0377113A JP 1213684 A JP1213684 A JP 1213684A JP 21368489 A JP21368489 A JP 21368489A JP H0377113 A JPH0377113 A JP H0377113A
Authority
JP
Japan
Prior art keywords
circuit
microcomputer
oscillation
external
clock
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
JP1213684A
Other languages
Japanese (ja)
Inventor
Tadashi Ikeda
正 池田
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1213684A priority Critical patent/JPH0377113A/en
Publication of JPH0377113A publication Critical patent/JPH0377113A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To eliminate useless oscillation of an external oscillation circuit and to reduce the power consumption of the circuit by controlling the operation of the circuit with use of an external command and a holding command of a microcomputer. CONSTITUTION:The clock CL transmitted from an oscillation circuit 2 is supplied to each internal part of a microcomputer 1 via its internal gate 1A. When a holding command SBY is produced, the gate 1A is closed and a clock stop command SST reaches a flip-flop 4 via a delay circuit 3. Then the flip-flop 4 is set, a transistor 5 is turned on, and the circuit 2 is grounded and stops its oscillation. When an external command OP is given to the microcomputer 1, the flip-flop 4 is reset and the TR 5 is turned off. Thus the circuit 2 restarts its oscillation, and the clock CL is supplied to each internal part via the gate 1A. As a result, the circuit 2 can work only for a period when the clock CL is required by the microcomputer 1.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明はマイクロコンピュータにクロックを供給する
外部発振回路に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an external oscillator circuit that supplies a clock to a microcomputer.

〔従来の技術〕[Conventional technology]

第3図において、1はスタンバイ機能を有するマイクロ
コンピュータ、2は外部発振回路である。外部発振回路
2はマイクロコンピュータ1内で使用するクロックCL
を発生し、マイクロコンピュータ1の内部ゲート1Aに
入力される。内部ゲートIAは待機指令〈スタンバイ〉
を受けるとクロックCLを遮断し、外部動作指令(外部
イベント)を受けると、クロックCLを通過させる。上
記待機指令はマイクロコンピュータlが指定されたプロ
グラムの実行を終了すると、発生する。
In FIG. 3, 1 is a microcomputer with a standby function, and 2 is an external oscillation circuit. The external oscillation circuit 2 is a clock CL used within the microcomputer 1.
is generated and input to the internal gate 1A of the microcomputer 1. Internal gate IA is a standby command (standby)
When an external operation command (external event) is received, the clock CL is passed. The standby command is generated when the microcomputer 1 finishes executing the specified program.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

このように、従来は、外部発振回路2に常時発振動作を
継続させておき、マイクロコンピータ1のスタンバイ時
には、内部ゲートIAでクロックCLを遮断する構成と
しであるので、外部発振回路2での電力消費が大きくな
るという問題があった。
In this way, conventionally, the external oscillator circuit 2 is kept in constant oscillation operation, and when the microcomputer 1 is on standby, the clock CL is cut off by the internal gate IA. There was a problem of increased consumption.

この発明は上記問題を解消するためにななされたもので
、外部発振回路の発振動作をマイクロコンピュータから
制御して消費電力を従来に比し低滅することができる外
部発振回路を提供することを目的とする。
This invention was made to solve the above problem, and an object of the present invention is to provide an external oscillation circuit that can control the oscillation operation of the external oscillation circuit from a microcomputer, thereby reducing power consumption compared to conventional ones. shall be.

〔課題を解決するための手段〕[Means to solve the problem]

この発明は上記目的を達成するため、待機指令に同期し
てマイクロコンピュータから送出される信号を遅延回路
を通し受信して上記発振回路の出力動作を停止させ、上
記マイクロコンピュータに対する外部動作指令を受けて
上記発振回路の上記出力動作の停止を解除する発振制御
回路を設けたものである。
In order to achieve the above object, the present invention receives a signal sent from a microcomputer in synchronization with a standby command through a delay circuit, stops the output operation of the oscillation circuit, and receives an external operation command for the microcomputer. An oscillation control circuit is provided for canceling the stoppage of the output operation of the oscillation circuit.

〔作用〕[Effect]

この発明では、マイクロコンピータの待機状態時、外部
発振回路の発振動作が停止され、マイクロコンピュータ
でクロックを必要とする間だけ、外部発振回路が発振動
作を行う。
In this invention, when the microcomputer is in a standby state, the oscillation operation of the external oscillation circuit is stopped, and the external oscillation circuit continues its oscillation operation only while the microcomputer requires a clock.

〔実施例) 以下、この発明の1実施例を図面を参照して説明する。〔Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

第1図において、3は遅延回路であって、マイクロコン
ピュータ1が待機指令SBYに同期して外部に送出する
クロック停止信号SSTを一定時間遅延させて、フリソ
プフップ4のセント端子に入力する。このフリップフロ
ップ4のリセット端子には外部動作指令OPが供給され
る。フリップフロップ4のセ・ノド出力はトランジスタ
5のベースに供給される。発振回路2はトランジスタ5
を介して接地されている。
In FIG. 1, reference numeral 3 denotes a delay circuit, which delays a clock stop signal SST, which is sent out from the microcomputer 1 to the outside in synchronization with the standby command SBY, by a certain period of time, and inputs the delayed clock signal SST to the cent terminal of the flip flop 4. An external operation command OP is supplied to the reset terminal of this flip-flop 4. The second node output of flip-flop 4 is supplied to the base of transistor 5. Oscillation circuit 2 is transistor 5
is grounded through.

この構成においては、発振回路2が送出するクロックC
Lはマイクロコンピュータ1の内部ゲ)IAを通して内
部の各部に供給される。待機指令SBYが発生すると、
内部ゲー)IAはゲートを閉じ、クロック停止指令SS
Tが遅延回路3を通し、フリップフロップ4に到達する
。これによりフリップフロップ4がセットされて、その
セット出力がHレベルになり、トランジスタ5がONL
、て、発振回路2が接地され、該発振回路2は発振動作
を停止する。外部動作指令opがマイクロコンピュータ
1に与えられると、内部ゲー)IAがゲトするとともに
フリップフロップ4がリセットされて、トランジスタ5
がOFFするので、発振回路2は発振動作を開始し、ク
ロックCLが内部ゲー)IAを通して内部の上記各部に
供給される。
In this configuration, the clock C sent out by the oscillation circuit 2
L is supplied to each internal part of the microcomputer 1 through an internal gate (IA). When standby command SBY occurs,
Internal game) IA closes the gate and issues a clock stop command SS
T passes through the delay circuit 3 and reaches the flip-flop 4. As a result, flip-flop 4 is set, its set output becomes H level, and transistor 5 turns ON.
, the oscillation circuit 2 is grounded, and the oscillation circuit 2 stops its oscillation operation. When the external operation command OP is given to the microcomputer 1, the internal gate (IA) is turned on, the flip-flop 4 is reset, and the transistor 5 is turned on.
is turned off, the oscillation circuit 2 starts oscillation operation, and the clock CL is supplied to each of the above-mentioned internal parts through the internal game (IA).

なお、第2図に遅延回路3、フリップフロップ4、トラ
ンジスタ5からなる発振制御回路および発振回路2の一
部をIC回路にまとめた例を示す。
Incidentally, FIG. 2 shows an example in which an oscillation control circuit consisting of a delay circuit 3, a flip-flop 4, and a transistor 5 and a part of the oscillation circuit 2 are combined into an IC circuit.

〔発明の効果〕〔Effect of the invention〕

この発明は以上説明した通り、マイクロコンピュータの
外部動作指令と待機指令を利用して、外部発振回路の動
作を制御する構成としたことにより、外部発振回路の無
駄な発振動作を無くすことができるので、従来に比し、
消費電力を低減することができる。
As explained above, this invention is configured to control the operation of the external oscillation circuit using the external operation command and standby command of the microcomputer, thereby eliminating unnecessary oscillation of the external oscillation circuit. , compared to the conventional
Power consumption can be reduced.

【図面の簡単な説明】[Brief explanation of drawings]

第1図および第2図はこの発明の実施例を示す回路図、
第3図は従来の外部発振回路とマイクロコンピュータの
関係を示す回路図である。 図において、1−マイクロコンピュータ、2発振回路、
3−・デイレイ回路、4−フリップフロップ、5−・−
トランジスタ なお、図中、同一符号は同一または相当部分を示す。
1 and 2 are circuit diagrams showing embodiments of the present invention,
FIG. 3 is a circuit diagram showing the relationship between a conventional external oscillation circuit and a microcomputer. In the figure, 1 - microcomputer, 2 oscillation circuit,
3-・Delay circuit, 4-Flip-flop, 5-・-
Note that in the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] スタンバイ機能を有するマイクロコンピュータのクロッ
クを外部から供給し、上記クロックが上記マイクロコン
ピュータの上記スタンバイ時に生起する待機指令を受け
てゲートする内部ゲートを通して使用される外部発振回
路において、上記待機指令に同期してマイクロコンピュ
ータから送出される信号を遅延回路を通し受信して上記
発振回路の出力動作を停止させ、上記マイクロコンピュ
ータに対する外部動作指令を受けて上記発振回路の上記
出力動作の停止を解除する発振制御回路を設けたことを
特徴とする外部発振回路。
A clock for a microcomputer having a standby function is supplied from the outside, and the clock is synchronized with the standby command in an external oscillation circuit used through an internal gate that gates in response to a standby command generated during standby of the microcomputer. oscillation control that receives a signal sent from the microcomputer through a delay circuit to stop the output operation of the oscillation circuit, and releases the stoppage of the output operation of the oscillation circuit in response to an external operation command to the microcomputer; An external oscillation circuit characterized by being provided with a circuit.
JP1213684A 1989-08-19 1989-08-19 External oscillation circuit Pending JPH0377113A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1213684A JPH0377113A (en) 1989-08-19 1989-08-19 External oscillation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1213684A JPH0377113A (en) 1989-08-19 1989-08-19 External oscillation circuit

Publications (1)

Publication Number Publication Date
JPH0377113A true JPH0377113A (en) 1991-04-02

Family

ID=16643271

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1213684A Pending JPH0377113A (en) 1989-08-19 1989-08-19 External oscillation circuit

Country Status (1)

Country Link
JP (1) JPH0377113A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0656579A2 (en) * 1993-12-01 1995-06-07 Advanced Micro Devices, Inc. Power management for computer system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0656579A2 (en) * 1993-12-01 1995-06-07 Advanced Micro Devices, Inc. Power management for computer system
EP0656579A3 (en) * 1993-12-01 1995-08-02 Advanced Micro Devices Inc Power management for computer system.
US5628020A (en) * 1993-12-01 1997-05-06 Advanced Micro Devices System oscillator gating technique for power management within a computer system

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