JPH0944276A - Power saving system - Google Patents

Power saving system

Info

Publication number
JPH0944276A
JPH0944276A JP7192235A JP19223595A JPH0944276A JP H0944276 A JPH0944276 A JP H0944276A JP 7192235 A JP7192235 A JP 7192235A JP 19223595 A JP19223595 A JP 19223595A JP H0944276 A JPH0944276 A JP H0944276A
Authority
JP
Japan
Prior art keywords
cpu
stop
timer
power saving
idle
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
JP7192235A
Other languages
Japanese (ja)
Inventor
Daichi Kobayashi
大地 小林
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 Gunma Ltd
Original Assignee
NEC Gunma 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 Gunma Ltd filed Critical NEC Gunma Ltd
Priority to JP7192235A priority Critical patent/JPH0944276A/en
Publication of JPH0944276A publication Critical patent/JPH0944276A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To complete calculation processing even when a CPU is erroneously changed into a sloppage state during that processing by stopping the CPU and providing a power saving function in a power saving system. SOLUTION: The idle state of a CPU 1 is detected by an idle detection circuit 5 and the stoppage state is forcedly canceled for a specified time by input signals from the idle detection circuit 5 and a timer 3 by a CPU operation/ stop control circuit 4. An IO port 2 sets count time to the timer 3.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、情報処理装置に関
し、特に、情報処理装置の省電力システムに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus, and more particularly to a power saving system for the information processing apparatus.

【0002】[0002]

【従来の技術】従来の情報処理装置の省電力システムに
ついて図面を参照して説明する。
2. Description of the Related Art A conventional power saving system for an information processing apparatus will be described with reference to the drawings.

【0003】図2は従来例の省電力システムを示すブロ
ック図である。
FIG. 2 is a block diagram showing a conventional power saving system.

【0004】アイドル検出回路13は、CPUのアクセ
スや入出力装置14からのアクセスを監視して、CPU
11がアイドル状態かどうかを判定する。アイドル検出
回路13がアイドル状態だと判断すると、CPU動作・
停止制御回路12に対してCPU停止リクエスト信号1
5をイネーブルにする。CPU動作・停止制御回路12
は、CPU11に対してCPU停止信号16をイネーブ
ルにし、CPU11は動作を停止する。CPU11が停
止しているためアイドル検出回路13は、入出力装置1
4からのアクセスがあるまでCPU停止リクエスト信号
15をイネーブルにし続ける。入出力装置14からアク
セスがあると、アイドル検出装置13はCPU停止リク
エスト信号15をディセーブルにする。CPU動作・停
止制御回路12はCPU停止信号16をディセーブルに
しCPU11は動作を再開する。
The idle detection circuit 13 monitors the CPU access and the access from the input / output device 14 to detect the CPU.
11. Determine if 11 is idle. When it is determined that the idle detection circuit 13 is in the idle state, the CPU operation
CPU stop request signal 1 to stop control circuit 12
Enable 5 CPU operation / stop control circuit 12
Enables the CPU stop signal 16 to the CPU 11, and the CPU 11 stops the operation. Since the CPU 11 is stopped, the idle detection circuit 13 is
The CPU stop request signal 15 is continuously enabled until there is an access from 4. When accessed by the input / output device 14, the idle detection device 13 disables the CPU stop request signal 15. The CPU operation / stop control circuit 12 disables the CPU stop signal 16 and the CPU 11 restarts the operation.

【0005】[0005]

【発明が解決しようとする課題】上述した従来の省電力
システムでは、現在CPUがアイドル状態か計算処理中
なのかを見極めることに主眼をおき、計算処理中はCP
Uを停止しないように苦心している。しかし、アイドル
時の動作はSWの作りなどに依存しするため、計算処理
状態とアイドル状態を完全に区別することは困難であ
る。
In the above conventional power saving system, the main purpose is to determine whether the CPU is currently in the idle state or in the process of calculation, and the CP is in process during the process of calculation.
I'm trying not to stop U. However, it is difficult to completely distinguish the calculation processing state and the idle state from each other, because the operation at the time of idling depends on the formation of the SW.

【0006】従って、計算処理中に誤ってCPUを停止
状態に移行すると、入出力装置などからの外部入力要因
がないとCPUを動作状態に復帰できないため、SWの
動作が停止し、計算処理が完了しないという問題があっ
た。
Therefore, if the CPU is erroneously shifted to the stopped state during the calculation process, the CPU cannot be returned to the operating state unless there is an external input factor from the input / output device, so that the SW operation is stopped and the calculation process is stopped. There was a problem of not completing.

【0007】[0007]

【課題を解決するための手段】本発明の省電力システム
は、CPUのアイドル状態を検出してCPUを停止させ
る省電力機能を有する情報処理装置の省電力システムで
あって、CPUのアイドル状態を検出しCPU停止信号
を出力するアイドル検出回路と、設定された時間が経過
する毎にCPU停止解除信号を出力するタイマと、アイ
ドル検出回路とタイマとからの入力信号によって規定時
間停止状態を強制的に解除する機能を有しCPUの動作
および停止を制御するCPU動作・停止制御回路と、C
PUからの命令によりタイマに対するカウント時間を設
定するIOポートとから構成されている。
A power-saving system of the present invention is a power-saving system for an information processing apparatus having a power-saving function for detecting the idle state of a CPU and stopping the CPU. An idle detection circuit that detects and outputs a CPU stop signal, a timer that outputs a CPU stop release signal each time a set time elapses, and an input signal from the idle detection circuit and the timer to force a stop state for a specified time. A CPU operation / stop control circuit for controlling the operation and stop of the CPU,
It is composed of an IO port that sets a count time for a timer according to an instruction from the PU.

【0008】[0008]

【発明の実施の形態】次に、本発明の実施例について図
面を参照して説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

【0009】図1は本発明の省電力システムの一実施の
形態を示すブロック図である。
FIG. 1 is a block diagram showing an embodiment of a power saving system of the present invention.

【0010】CPU1は、タイマ制御IO2に対してデ
ータを設定し、カウントする時間をタイマに設定してお
く。アイドル検出回路5は、CPU1のアクセスや入出
力装置9からのアクセスなどを監視してCPU1がアイ
ドル状態かどうかを判定する。アイドル検出回路5は、
CPU1が現在アイドル状態にあると判断すると、CP
U1を停止させるようにCPU動作・停止制御回路4に
CPU停止リクエスト信号8を送出する。CPU動作・
停止制御回路4は、CPU停止リクエスト信号8を検出
し、CPU1にCPU停止信号7を送出する。これを受
けてCPU1は動作を停止する。CPU1が停止状態に
あるためアイドル検出回路5は、入出力装置9からのア
クセス等がなければ常にCPU1はアイドル状態だと判
断してCPU停止リクエスト信号8をアクティブにし続
ける。
The CPU 1 sets data for the timer control IO2 and sets the counting time in the timer. The idle detection circuit 5 monitors the access of the CPU 1 and the access from the input / output device 9 and determines whether the CPU 1 is in the idle state. The idle detection circuit 5 is
When it is determined that the CPU1 is currently in the idle state, CP
A CPU stop request signal 8 is sent to the CPU operation / stop control circuit 4 so as to stop U1. CPU operation
The stop control circuit 4 detects the CPU stop request signal 8 and sends the CPU stop signal 7 to the CPU 1. In response to this, the CPU 1 stops its operation. Since the CPU 1 is in the stopped state, the idle detection circuit 5 always determines that the CPU 1 is in the idle state and keeps the CPU stop request signal 8 active unless there is an access from the input / output device 9.

【0011】タイマ3は、制御IO2に設定された時間
が経過する毎に、CPU停止解除信号6を出力する。C
PU動作・停止制御回路4は、CPU停止解除信号6を
検出すると、規定時間CPU停止信号7をディセーブル
にする。従って、CPU1は動作状態に復帰する。規定
時間が経過した後、CPU停止制御回路4はCPU停止
信号7を再度イネーブルにする。CPU停止信号7が再
度アクティブとなったため、CPU1は再び動作を停止
する。
The timer 3 outputs a CPU stop release signal 6 every time the time set in the control IO 2 has elapsed. C
Upon detecting the CPU stop release signal 6, the PU operation / stop control circuit 4 disables the CPU stop signal 7 for a specified time. Therefore, the CPU 1 returns to the operating state. After the specified time has elapsed, the CPU stop control circuit 4 enables the CPU stop signal 7 again. Since the CPU stop signal 7 becomes active again, the CPU 1 stops operating again.

【0012】アイドル検出回路5は、KB入力などの入
力装置からのアクセスを検出すると、CPU停止リクエ
スト信号8をインアクティブにする。これを検出する
と、CPU動作・停止制御回路4はCPU停止信号6を
ディセーブルにする。CPU1は動作を再開する。
When the idle detection circuit 5 detects an access from an input device such as a KB input, it makes the CPU stop request signal 8 inactive. When this is detected, the CPU operation / stop control circuit 4 disables the CPU stop signal 6. The CPU 1 resumes its operation.

【0013】[0013]

【発明の効果】以上説明したように、本発明の省電力シ
ステムは、CPUのアイドル状態を検出しCPU停止信
号を出力するアイドル検出回路と、設定された時間が経
過する毎にCPU停止解除信号を出力するタイマと、ア
イドル検出回路とタイマとからの入力信号によって規定
時間停止状態を強制的に解除する機能を有しCPUの動
作および停止を制御するCPU動作・停止制御回路とを
有することにより、CPUを停止させ省電力機能を実現
できると共に、計算処理中に誤ってCPUが停止状態に
移行しても、CPU動作・停止制御回路により規定時間
停止状態を強制的に解除してその計算処理を完了できる
という効果がある。
As described above, in the power saving system of the present invention, the idle detection circuit that detects the idle state of the CPU and outputs the CPU stop signal, and the CPU stop release signal every time the set time elapses. And a CPU operation / stop control circuit that has a function of forcibly canceling the stopped state for a specified time by an input signal from the idle detection circuit and the timer and that controls the operation and stop of the CPU. In addition to realizing the power saving function by stopping the CPU, even if the CPU accidentally shifts to the stopped state during the calculation process, the CPU operation / stop control circuit forcibly cancels the stop state for the specified time and performs the calculation process. There is an effect that can be completed.

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

【図1】本発明の省電力システムの一実施の形態を示す
ブロック図である。
FIG. 1 is a block diagram showing an embodiment of a power saving system of the present invention.

【図2】従来例の省電力システムを示すブロック図であ
る。
FIG. 2 is a block diagram showing a conventional power saving system.

【符号の説明】 1 CPU 2 タイマ制御IO 3 タイマ 4 CPU動作・停止制御回路 5 アイドル検出回路 6 CPU停止解除信号 7 CPU停止信号 8 CPU停止リクエスト信号 11 CPU 12 CPU動作・停止制御回路 13 アイドル検出回路 14 入出力装置 15 CPU停止リクエスト信号 16 CPU停止信号[Description of Codes] 1 CPU 2 Timer control IO 3 Timer 4 CPU operation / stop control circuit 5 Idle detection circuit 6 CPU stop release signal 7 CPU stop signal 8 CPU stop request signal 11 CPU 12 CPU operation / stop control circuit 13 Idle detection Circuit 14 Input / output device 15 CPU stop request signal 16 CPU stop signal

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 CPUのアイドル状態を検出して前記C
PUを停止させる省電力機能を有する情報処理装置の省
電力システムであって、 前記CPUのアイドル状態を検出しCPU停止信号を出
力するアイドル検出回路と、設定された時間が経過する
毎にCPU停止解除信号を出力するタイマと、前記アイ
ドル検出回路と前記タイマとからの入力信号によって規
定時間停止状態を強制的に解除する機能を有し前記CP
Uの動作および停止を制御するCPU動作・停止制御回
路と、前記CPUからの命令により前記タイマに対する
カウント時間を設定するIOポートとから構成されるこ
とを特徴とする省電力システム。
1. The CPU detects an idle state of a CPU to detect the C
A power saving system for an information processing apparatus having a power saving function for stopping a PU, comprising: an idle detection circuit that detects an idle state of the CPU and outputs a CPU stop signal; and a CPU stop every time a set time elapses. The CP having a timer for outputting a cancellation signal and a function for forcibly canceling the stopped state for a prescribed time by an input signal from the idle detection circuit and the timer
A power-saving system comprising a CPU operation / stop control circuit for controlling the operation and stop of U, and an IO port for setting a count time for the timer in response to an instruction from the CPU.
JP7192235A 1995-07-27 1995-07-27 Power saving system Pending JPH0944276A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7192235A JPH0944276A (en) 1995-07-27 1995-07-27 Power saving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7192235A JPH0944276A (en) 1995-07-27 1995-07-27 Power saving system

Publications (1)

Publication Number Publication Date
JPH0944276A true JPH0944276A (en) 1997-02-14

Family

ID=16287906

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7192235A Pending JPH0944276A (en) 1995-07-27 1995-07-27 Power saving system

Country Status (1)

Country Link
JP (1) JPH0944276A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6788698B1 (en) 1999-03-23 2004-09-07 Kabushiki Kaisha Toshiba Data switching apparatus and data switching method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06175754A (en) * 1992-12-02 1994-06-24 Hitachi Ltd Automatic storing mechanism for main contents of storage

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06175754A (en) * 1992-12-02 1994-06-24 Hitachi Ltd Automatic storing mechanism for main contents of storage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6788698B1 (en) 1999-03-23 2004-09-07 Kabushiki Kaisha Toshiba Data switching apparatus and data switching method

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