JPH0232134U - - Google Patents
Info
- Publication number
- JPH0232134U JPH0232134U JP10777788U JP10777788U JPH0232134U JP H0232134 U JPH0232134 U JP H0232134U JP 10777788 U JP10777788 U JP 10777788U JP 10777788 U JP10777788 U JP 10777788U JP H0232134 U JPH0232134 U JP H0232134U
- Authority
- JP
- Japan
- Prior art keywords
- transistor
- microcomputer
- circuit
- reset
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 4
Description
第１図乃至第３図は本考案の実施例を示すもの
で、第１図は回路図、第２図はマイクロコンピユ
ータ迷走時の動作を説明するための信号波形図、
第３図は瞬時停電時の動作を説明するための信号
波形図、第４図は先願例を示す回路図である。
２９……無安定マルチ回路、３４……コンデン
サ、３５……比較器、４１……マイクロコンピユ
ータ、４２……第１のトランジスタ、４６……微
分回路、５０……第２のトランジスタ。
1 to 3 show an embodiment of the present invention; FIG. 1 is a circuit diagram; FIG. 2 is a signal waveform diagram for explaining the operation when the microcomputer wanders;
FIG. 3 is a signal waveform diagram for explaining the operation during a momentary power outage, and FIG. 4 is a circuit diagram showing an example of a prior application. 29... Astable multi-circuit, 34... Capacitor, 35... Comparator, 41... Microcomputer, 42... First transistor, 46... Differentiating circuit, 50... Second transistor.
Claims (1)
号を出力し、迷走時デジタル信号の出力を停止す
るマイクロコンピユータの出力ポートと、この出
力ポートからの信号を微分する微分回路と、この
微分回路出力に応動する第１のトランジスタと、
電源の電圧低下を検知してオン動作する第２のト
ランジスタと、前記第１のトランジスタのオフ、
オン動作によつて比較的遅い速度で充放電される
とともに、前記第２のトランジスタのオン動作に
よつて比較的早い速度で充電されるコンデンサと
、このコンデンサの充電レベルが予め設定された
所定レベルに達すると動作して前記マイクロコン
ピユータのリセツト端子にリセツト信号を供給す
る無安定マルチ回路からなることを特徴とするマ
イクロコンピユータのリセツト回路。 An output port of a microcomputer that outputs a digital signal of a fixed period when program control is normal and stops outputting the digital signal when it strays, a differentiation circuit that differentiates the signal from this output port, and a differential circuit that responds to the output of this differentiation circuit. a first transistor;
a second transistor that turns on by detecting a voltage drop in the power supply; and a second transistor that turns on the first transistor;
a capacitor that is charged and discharged at a relatively slow speed when turned on and charged at a relatively fast speed when the second transistor is turned on; and a predetermined charge level of the capacitor that is set in advance. 1. A reset circuit for a microcomputer, comprising an astable multi-circuit that operates when a reset signal reaches a reset terminal of the microcomputer and supplies a reset signal to a reset terminal of the microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988107777U JPH0624898Y2 (en) | 1988-08-16 | 1988-08-16 | Reset circuit of microcomputer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988107777U JPH0624898Y2 (en) | 1988-08-16 | 1988-08-16 | Reset circuit of microcomputer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0232134U true JPH0232134U (en) | 1990-02-28 |
| JPH0624898Y2 JPH0624898Y2 (en) | 1994-06-29 |
Family
ID=31342498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988107777U Expired - Lifetime JPH0624898Y2 (en) | 1988-08-16 | 1988-08-16 | Reset circuit of microcomputer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0624898Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58169219A (en) * | 1982-03-31 | 1983-10-05 | Nec Home Electronics Ltd | Memory contents holding system of microcomputer |
| JPS59225418A (en) * | 1983-06-03 | 1984-12-18 | Koito Mfg Co Ltd | Power supply controlling circuit |
-
1988
- 1988-08-16 JP JP1988107777U patent/JPH0624898Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58169219A (en) * | 1982-03-31 | 1983-10-05 | Nec Home Electronics Ltd | Memory contents holding system of microcomputer |
| JPS59225418A (en) * | 1983-06-03 | 1984-12-18 | Koito Mfg Co Ltd | Power supply controlling circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0624898Y2 (en) | 1994-06-29 |
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