JPS594042U - Watchdog timer circuit - Google Patents
Watchdog timer circuitInfo
- Publication number
- JPS594042U JPS594042U JP6779583U JP6779583U JPS594042U JP S594042 U JPS594042 U JP S594042U JP 6779583 U JP6779583 U JP 6779583U JP 6779583 U JP6779583 U JP 6779583U JP S594042 U JPS594042 U JP S594042U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- electronic circuit
- oscillator
- pulse
- reset
- 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
Landscapes
- Electronic Switches (AREA)
- Debugging And Monitoring (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
図は本考案の一実施例を示す回路図である。
図面中、■は発振器、■はリセット回路、１はマイクロ
プロセッサ、２はシュミットトリガゲート、３はインバ
ータ、４はＲＣ積分回路、５は２人力ナンドゲート、６
は微分回路、８はトランジスタ、Ｒ１は帰環抵抗、Ｃ工
はコンデンサ、Ｒはリセット端子、ＰＲはプログラムに
より発生したパルスの出力端子である。The figure is a circuit diagram showing an embodiment of the present invention. In the drawing, ■ is an oscillator, ■ is a reset circuit, 1 is a microprocessor, 2 is a Schmitt trigger gate, 3 is an inverter, 4 is an RC integration circuit, 5 is a two-man NAND gate, 6
8 is a differential circuit, 8 is a transistor, R1 is a return resistor, C is a capacitor, R is a reset terminal, and PR is an output terminal for pulses generated by the program.
Claims (1)
プログラムによりこの電子回路から予め定めた時間内の
間隔で発信されるパルスを入力とし、このパルスが前記
予め定めた時間内に発信されないことを検出して前記電
子回路の動作を初期状態にリセットさせる信号を該電子
回路へ送出するウオッチドックタイマ回路において、と
もに前記電子回路のパルスを入力するＲＣ積分回路及び
インバータ並びにこれらの出力を入力する２人力ナンド
ゲートで構成した微分回路と、シュミットトリガゲート
、その帰環抵抗及びコンデンサで構成し前記電子回路へ
のリセット用信号を発振する発振器と、 トランジスタ及び抵抗で構成し前記微分回路の出力信号
により駆動されて前記発振器のコンデンサを放電させる
リセット回路と、 からなることを特徴とするウォッチドッグタイマ回路。[Claims for Utility Model Registration] The input is a pulse that is connected to an electronic circuit that operates according to a program and is emitted from this electronic circuit at predetermined time intervals according to the program, and that this pulse is transmitted within the predetermined time interval. In a watchdog timer circuit that detects that the electronic circuit is not being transmitted and sends a signal to the electronic circuit to reset the operation of the electronic circuit to the initial state, an RC integrating circuit and an inverter that both input the pulse of the electronic circuit, and an inverter thereof. A differentiating circuit made up of a two-man NAND gate inputting an output, an oscillator made up of a Schmitt trigger gate, its return resistor, and a capacitor and oscillating a reset signal to the electronic circuit, and a differentiating circuit made up of a transistor and a resistor. a reset circuit that is driven by an output signal of the oscillator to discharge a capacitor of the oscillator;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6779583U JPS594042U (en) | 1983-05-09 | 1983-05-09 | Watchdog timer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6779583U JPS594042U (en) | 1983-05-09 | 1983-05-09 | Watchdog timer circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS594042U true JPS594042U (en) | 1984-01-11 |
Family
ID=30197984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6779583U Pending JPS594042U (en) | 1983-05-09 | 1983-05-09 | Watchdog timer circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS594042U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0468422A (en) * | 1990-07-09 | 1992-03-04 | Matsushita Electron Corp | Microcomputer |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5557956A (en) * | 1978-10-25 | 1980-04-30 | Nissan Motor Co Ltd | Malfunction prevention unit of microcomputer |
-
1983
- 1983-05-09 JP JP6779583U patent/JPS594042U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5557956A (en) * | 1978-10-25 | 1980-04-30 | Nissan Motor Co Ltd | Malfunction prevention unit of microcomputer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0468422A (en) * | 1990-07-09 | 1992-03-04 | Matsushita Electron Corp | Microcomputer |
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