JPS6198002A - Oscillation device - Google Patents

Oscillation device

Info

Publication number
JPS6198002A
JPS6198002A JP21901184A JP21901184A JPS6198002A JP S6198002 A JPS6198002 A JP S6198002A JP 21901184 A JP21901184 A JP 21901184A JP 21901184 A JP21901184 A JP 21901184A JP S6198002 A JPS6198002 A JP S6198002A
Authority
JP
Japan
Prior art keywords
oscillation
frequency divider
stop
stop signal
signal
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
JP21901184A
Other languages
Japanese (ja)
Inventor
Shinichiro Akeyama
明山 慎一郎
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
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 filed Critical NEC Corp
Priority to JP21901184A priority Critical patent/JPS6198002A/en
Publication of JPS6198002A publication Critical patent/JPS6198002A/en
Pending legal-status Critical Current

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  • Oscillators With Electromechanical Resonators (AREA)

Abstract

PURPOSE:To prevent completely the malfunction of an information processor, etc., due to the delay of the stopping operation of an oscillator by resetting a frequency divider simultaneously with the stop of oscillation based upon an oscillation stop signal. CONSTITUTION:When the logical level of the oscillation stop signal 9 is low, the oscillation circuit 1 oscillates at a specific frequency, but when the logical level of the oscillation stop signal 9 is high, the oscillation circuit 1 stops oscillating and the frequency divider 2a is reset with the oscillation stop signal 9 and outputs a low-level signal. In this case, even if the oscillation of the oscillation circuit 1 does not stop completely, or if the time delay of the oscillation stop occurs, the supply of a clock signal to the information processor from the output 10 is stopped completely at desired timing by the resetting of the frequency divider 2a.

Description

【発明の詳細な説明】 〔庄菜上の利用分野〕 本発明は発振装置に関し、特にクロック信号を発生する
発振器に関するものである。一般:;情報処理装置等は
、その制御がクロック信号で行なわれており、そのクロ
ック信号の発生(二は発振器が用いられている。
DETAILED DESCRIPTION OF THE INVENTION [Field of Application] The present invention relates to an oscillator, and more particularly to an oscillator that generates a clock signal. General: Information processing devices and the like are controlled by clock signals, and an oscillator is used to generate the clock signals.

本発明は待(二、水晶発振子のような穢械的倣勅を電気
信号(二変換する発振器に関し、さらI:j#報処理装
置からの、または外部からの発振停止信号(二より、情
報処理装置へのクロック信号の供給を停止して、装置の
動作停止時の誤動作防止を目的とした発振装置1:関す
る。
The present invention relates to an oscillator that converts a mechanical imitation such as a crystal oscillator into an electrical signal (2), and further relates to an oscillator that converts an oscillation stop signal (2) from an information processing device or from an external source (2). Oscillation device 1 for stopping the supply of a clock signal to an information processing device to prevent malfunction when the device stops operating.

〔従来技術〕[Prior art]

従来から実施されている相補型MO8(以下、0MO8
と略記する)のトランジスタで構成された発振停止手段
をもつ発振装置(OSC)の−例を、第1図に示す。
Complementary MO8 (hereinafter referred to as 0MO8) which has been implemented conventionally
An example of an oscillation device (OSC) having an oscillation stopping means constituted by a transistor (abbreviated as ) is shown in FIG.

第1図1=おいて発振回路(1)は、0MO8のインバ
ータ(4、5)、NfヤンネルMO8(以下、NMO8
と略記する)のトランジスタ(6,7)、Pチャンネル
MO8(以下、PMO8と略記する)のトランジスタ(
8)、水晶振動子などの発振子(6)用の接続端子(X
I 、 Xs )から成り、発振停止の信号(9)が、
インバータ(4)に入力されると共に、NMO3のトラ
ンジスタ(7)、PMO8のトランジスタ(8)のゲー
ト(二番々入力され、インバータ(4)の出力は、NM
O8のトランジスタ(6)のゲ−トに入力される。
The oscillation circuit (1) in FIG.
transistors (6, 7) of P-channel MO8 (hereinafter abbreviated as PMO8)
8), connection terminal (X
I, Xs), and the oscillation stop signal (9) is
The output of the inverter (4) is input to the gates of the transistor (7) of NMO3 and the transistor (8) of PMO8.
It is input to the gate of transistor (6) of O8.

ここでNMO8のトランジスタ(6)とPMOSのトラ
ンジスタ(8)は並列償続されており、インバータ(5
)のフィードバック抵抗を兼ねている。
Here, the NMO8 transistor (6) and the PMOS transistor (8) are connected in parallel, and the inverter (5)
) also serves as a feedback resistance.

またインバータ(5)からの発振出力(11)は、分周
器(2)(二上って所望の周波数に分周され、出力(1
0)はクロック信号として図軍略の情報処理装置(二供
給される。
In addition, the oscillation output (11) from the inverter (5) is divided into a desired frequency by the frequency divider (2) (2), and the output (1
0) is supplied as a clock signal to an information processing device (not shown).

第1図の発振回路(1)で、発振停止の信号(9)の論
理レベルが、パロウTレベルの場合は、NMO8のトラ
ンジスタ(7)がオフし、NMOSのトランジスタ(6
)、PMO8のトランジスタ(8)が共にオンしている
ため、発振回路(1)が所定の周波数で発振し、インバ
ータ(5)の発振出力(11)は分周器(2)で分周さ
れ、出力(10)へ出力される。
In the oscillation circuit (1) shown in FIG. 1, when the logic level of the oscillation stop signal (9) is at the parou T level, the NMO8 transistor (7) is turned off, and the NMOS transistor (6
), the transistors (8) of PMO8 are both on, so the oscillation circuit (1) oscillates at a predetermined frequency, and the oscillation output (11) of the inverter (5) is divided by the frequency divider (2). , is output to output (10).

次に発振停止信号(9)の論理レベルが“ハイ”レベル
(二なると、NMO8のトランジスタ(7)がオンして
、インバータ(5)の入力の論理レベルが“ロク”レベ
ルに固定されると共(二、NMO8のトランジスタ(6
)とPMO8のトランジスタ(8)はオフになるため、
インバータ(5)のフィードバック・ループは切断され
る。従ってインバータ(5)より“ハイ”レベルが出力
され、分周器(2)の出力(10)は、“ハイ”または
“ロク”のいずれかノ論理レベルで停止する。
Next, when the logic level of the oscillation stop signal (9) reaches the "high" level (2), the transistor (7) of NMO8 turns on and the logic level of the input of the inverter (5) is fixed at the "low" level. Both (2, NMO8 transistor (6)
) and PMO8 transistor (8) are turned off, so
The feedback loop of the inverter (5) is broken. Therefore, the inverter (5) outputs a "high" level, and the output (10) of the frequency divider (2) stops at either the "high" or "low" logic level.

通常、出力(10)が常(二いずれか一方の論理レベル
で停止するよう(二、発振停止信号(9)のタイミング
を制御する。
Normally, the timing of the oscillation stop signal (9) is controlled so that the output (10) always stops at one of the logic levels.

ところで第1図の従来例での発振停止は、発振停止の信
号(9)を“ハイ”レベルとすることにより、NMO8
のトランジスタ(7)をオンさせて、インバータ(5)
の入力を“ロク”レベルに抑え込む方法であるため、N
MO8のトランジスタ(7)のオン時のインピーダンス
が問題となる。
By the way, in the conventional example shown in FIG. 1, oscillation is stopped by setting the oscillation stop signal (9) to a "high" level.
The transistor (7) is turned on, and the inverter (5) is turned on.
Since this is a method of suppressing the input of
The impedance of the MO8 transistor (7) when it is on becomes a problem.

NMO8のトランジスタ(7)のインピーダンスカ大キ
い場合、インバータ(5)の入力レベルを“口 。
If the impedance of the transistor (7) of NMO8 is large, the input level of the inverter (5) should be set to "0".

ワ”レベル論理のスレッシュホールド以下にできず、発
振が停止しないこと(二なる。
The oscillation cannot be stopped because the level cannot be lowered below the threshold of the "wa" level logic (2).

また、例えば発振周波数が数M Hz以上というよう(
二晶い場合は、発振停止信号の発生後、インバータ(5
)の入力が“ロク”レベル論理のスレッシュホールド以
下になるまでの時間遅れ(二より、その間、発振が行わ
れ、情報処理装置本来の動作停止すべきタイミングで停
止できず、その後の動作不良を招くという欠点があった
Also, for example, when the oscillation frequency is several MHz or more (
In the case of double crystal, after the oscillation stop signal is generated, the inverter (5
) until the input becomes below the threshold of the "Lock" level logic (Secondly, during this period, oscillation occurs, and the information processing device cannot stop its operation at the timing when it should, causing subsequent malfunctions.) It had the disadvantage of inviting people.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

本発明は上述の欠点(二鐵みてなされたもので、発振停
止の信号(二より発振を停止させると同時に、分周器を
リセットすること(二より、情報処理装置セ供給するク
ロックを完全セ停止し、発振器の停止動作の遅れ(二よ
る情報処理装置等の誤動作を、完全1=防止する発振装
置の提供にある。
The present invention was made in view of the above-mentioned drawbacks (2), and it is necessary to stop the oscillation by the oscillation stop signal (2) and at the same time reset the frequency divider (2) to completely reset the clock supplied to the information processing device. An object of the present invention is to provide an oscillation device that completely prevents malfunctions of information processing devices, etc. due to delays in the stopping operation of the oscillator.

〔問題点を解決するための手段〕[Means for solving problems]

本発明によると、発振停止の信号により、発振回路を停
止状態にし、さら(二分周器をリセットするこ゛とによ
り、発振回路の発振が完全に停止しきれない場合におい
ても、分周器を同時(ユリセットするため、情報処理装
置等に供給するクロック信号を完全(二停止させること
ができる。
According to the present invention, the oscillation circuit is brought to a halt state by the oscillation stop signal, and the frequency divider (divider by two) is reset. In order to reset the clock signal, the clock signal supplied to the information processing device etc. can be completely stopped.

〔実施例〕〔Example〕

次(二本発明C二よる一実施例1:ついて説明する。 Next (Example 1 according to the present invention C2) will be explained.

82図は本発明の実施例の発振装置7(O8CR)であ
る。第2図で発振回路(1)は、第1図の従来例と同一
のものであり、この実施例では、発振停止の信号(9)
が、さらに分周器(2a)のリセット山号として入力さ
れているところ(二特徴がある。
FIG. 82 shows the oscillation device 7 (O8CR) according to the embodiment of the present invention. The oscillation circuit (1) in FIG. 2 is the same as the conventional example in FIG. 1, and in this embodiment, the oscillation stop signal (9)
is further input as the reset peak number of the frequency divider (2a) (there are two characteristics.

第2因で発振停止の信号(9)の論理レベルが“ロク”
の時の動作は1.第1図で説明した従来例と同様である
The logic level of the oscillation stop signal (9) is “locked” due to the second cause.
The operation when is 1. This is similar to the conventional example explained in FIG.

仄菟;発振停止信号(9)の論理レベルが“ハイ′″と
なると、発振回路(1)は第1図の従来例と同様(二、
発振停止となると共に、分周器(2a)は発振停止信号
(9):二よりリセットされ、“ロク”レベルを出力す
る。
Note: When the logic level of the oscillation stop signal (9) becomes "high'", the oscillation circuit (1) operates as in the conventional example shown in FIG.
At the same time as the oscillation is stopped, the frequency divider (2a) is reset by the oscillation stop signal (9):2 and outputs the "rock" level.

この場合、′s1図の従来例で述べたような発振回路(
1)の発振が完全に停止しないか、発振停止の時間遅れ
が生じても、分周器(2a)のリセット(二より、出力
(10)から因示略の情報処理装置へのクロック信号の
供給を所望のタイミングで完全に停止できる。
In this case, the oscillation circuit (
Even if the oscillation of 1) does not completely stop or there is a time delay in stopping oscillation, the frequency divider (2a) is reset (from 2) the clock signal is not output from the output (10) to the unspecified information processing device. Supply can be completely stopped at desired timing.

〔発明の効果〕〔Effect of the invention〕

以上、説明したよう5二、本発明シーよると、分周器を
備えた発振装置において、簡単なハードウェアの追加(
二より、完至(−クロック信号の供給停止を実現するこ
とができ、クロック停止モードをもつマイクロコンピュ
ータ等においては、その効果に大きいものがある。
As explained above, according to the present invention, in an oscillation device equipped with a frequency divider, simple hardware addition (
From the second point, it is possible to stop the supply of the clock signal, and the effect is great in microcomputers and the like that have a clock stop mode.

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

第1図は、発振停止機能をもつ発振装置の一従来例を示
す回路図、第2図は本発明(二よる一実施例を示す回路
図である。
FIG. 1 is a circuit diagram showing a conventional example of an oscillation device having an oscillation stop function, and FIG. 2 is a circuit diagram showing an embodiment according to the present invention.

Claims (1)

【特許請求の範囲】[Claims] 発振停止の信号レベルにて制御される発振停止手段をも
つ発振回路と、該発振回路の発振出力を分周し、上記発
振停止の信号レベルによりリセツトされる分周器とから
なり、上記発振停止信号が所定の信号レベルとなつたと
き、前記発振回路の発振を停止すると同時に上記分周器
をリセツトして、所定の信号レベルを出力するようにし
たことを特徴とする発振装置。
It consists of an oscillation circuit having an oscillation stop means that is controlled by the oscillation stop signal level, and a frequency divider that divides the oscillation output of the oscillation circuit and is reset by the oscillation stop signal level. An oscillation device characterized in that when a signal reaches a predetermined signal level, the oscillation of the oscillation circuit is stopped and at the same time the frequency divider is reset to output a predetermined signal level.
JP21901184A 1984-10-18 1984-10-18 Oscillation device Pending JPS6198002A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21901184A JPS6198002A (en) 1984-10-18 1984-10-18 Oscillation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21901184A JPS6198002A (en) 1984-10-18 1984-10-18 Oscillation device

Publications (1)

Publication Number Publication Date
JPS6198002A true JPS6198002A (en) 1986-05-16

Family

ID=16728859

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21901184A Pending JPS6198002A (en) 1984-10-18 1984-10-18 Oscillation device

Country Status (1)

Country Link
JP (1) JPS6198002A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57101434A (en) * 1980-12-16 1982-06-24 Toshiba Corp Oscillator
JPS5994122A (en) * 1982-11-19 1984-05-30 Hitachi Ltd Timing generating circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57101434A (en) * 1980-12-16 1982-06-24 Toshiba Corp Oscillator
JPS5994122A (en) * 1982-11-19 1984-05-30 Hitachi Ltd Timing generating circuit

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