JPH0227219U - - Google Patents
Info
- Publication number
- JPH0227219U JPH0227219U JP10309088U JP10309088U JPH0227219U JP H0227219 U JPH0227219 U JP H0227219U JP 10309088 U JP10309088 U JP 10309088U JP 10309088 U JP10309088 U JP 10309088U JP H0227219 U JPH0227219 U JP H0227219U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- digital signal
- reset
- signal
- microcomputer
- 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
Links
- 230000004069 differentiation Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 1
Description
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による出力
ポートＰ２へのデジタル信号の出力制御を説明す
るための流れ図である。
１０……無安定マルチ回路、１６……マイクロ
コンピユータ、２５……ＮＰＮ形トランジスタ、
２９……微分回路。
The figures show an embodiment of the present invention; FIG. 1 is a circuit diagram, and FIG. 2 is a flowchart for explaining output control of a digital signal to output port P2 by a microcomputer. 10... Astable multi-circuit, 16... Microcomputer, 25... NPN transistor,
29... Differential circuit.
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トランジスタと、このト
ランジスタのオフ時動作を開始し、そのオフ動作
が少なくとも前記デジタル信号の周期を越える一
定時間以上継続すると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
ンピユータの迷走リセツト回路。 An output port of a microcomputer that outputs a digital signal of a constant 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 transistor, and an astable multi-circuit that starts the off-state operation of the transistor and supplies a reset signal to the reset terminal of the microcomputer when the off-state operation continues for at least a certain period of time exceeding the period of the digital signal. Features a stray reset circuit for microcomputers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10309088U JPH0227219U (en) | 1988-08-03 | 1988-08-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10309088U JPH0227219U (en) | 1988-08-03 | 1988-08-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0227219U true JPH0227219U (en) | 1990-02-22 |
Family
ID=31333597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10309088U Pending JPH0227219U (en) | 1988-08-03 | 1988-08-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0227219U (en) |
-
1988
- 1988-08-03 JP JP10309088U patent/JPH0227219U/ja active Pending
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