JPH0292539U - - Google Patents
Info
- Publication number
- JPH0292539U JPH0292539U JP17130288U JP17130288U JPH0292539U JP H0292539 U JPH0292539 U JP H0292539U JP 17130288 U JP17130288 U JP 17130288U JP 17130288 U JP17130288 U JP 17130288U JP H0292539 U JPH0292539 U JP H0292539U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- shift register
- feedback shift
- linear feedback
- 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
- Debugging And Monitoring (AREA)
Description
第１図はこの考案の一実施例に係るウオツチド
ツグタイマ回路の構成を示すブロツク図、第２図
は第１実施例の構成を示す回路図、第３図は状態
信号１３０、空間信号２９０ａ、識別子２９０ｂ
の状態を説明するための表図、第４図は第２実施
例の構成を示す回路図である。
１０……線形帰還シフトレジスタ、２０……比
較回路、３０……ウオツチドツグタイマ検査回路
、１１０……リセツト信号、１２０……クロツク
信号、１３０……状態信号、２２０……ウオツチ
ドツグ信号、３１０……ウオツチドツグタイマ検
査信号。
FIG. 1 is a block diagram showing the structure of a watchdog timer circuit according to an embodiment of the invention, FIG. 2 is a circuit diagram showing the structure of the first embodiment, and FIG. 3 shows a state signal 130 and a spatial signal. 290a, identifier 290b
FIG. 4 is a circuit diagram showing the configuration of the second embodiment. DESCRIPTION OF SYMBOLS 10... Linear feedback shift register, 20... Comparison circuit, 30... Watchdog timer inspection circuit, 110... Reset signal, 120... Clock signal, 130... Status signal, 220... Watchdog signal, 310 ...Watchdog timer test signal.
Claims (1)
て発生されるリセツト信号の周期をクロツクより
発生される短周期のクロツク信号を用いて観測し
、この周期が許容範囲から外れた時にマイクロコ
ンピユータの異常を知らせるウオツチドツグタイ
マ回路において、 前記クロツク信号によつて順次状態をシフトし
、前記リセツト信号によつて状態をリセツトする
とともに、状態についての状態信号を出力する線
形帰還シフトレジスタ回路と、 この線形帰還シフトレジスタ回路の状態信号が
所定値になつた時に異常信号を出力する比較回路
と、 前記線形帰還シフトレジスタ回路の状態信号、
前記比較回路の出力信号、前記リセツト信号、前
記クロツク信号が入力され、これら入力信号につ
いて所定の論理演算を行うことにより線形帰還シ
フトレジスタ回路及び比較回路の異常を検知する
ウオツチドツグ検査回路と、 を有し、 ウオツチドツグタイマ自体の故障も検知できる
ことを特徴とするウオツチドツグタイマ回路。[Claims for Utility Model Registration] The cycle of the reset signal generated according to the control program of the microcomputer is observed using a short cycle clock signal generated by the clock, and when this cycle is out of the allowable range, the microcomputer In a watchdog timer circuit that notifies an abnormality in a computer, a linear feedback shift register circuit that sequentially shifts states according to the clock signal, resets the states according to the reset signal, and outputs a status signal regarding the status. and a comparison circuit that outputs an abnormal signal when the state signal of the linear feedback shift register circuit reaches a predetermined value; and the state signal of the linear feedback shift register circuit;
A watchdog test circuit receives the output signal of the comparison circuit, the reset signal, and the clock signal, and performs a predetermined logical operation on these input signals to detect abnormalities in the linear feedback shift register circuit and the comparison circuit. However, a watchdog timer circuit is characterized in that it can also detect a failure of the watchdog timer itself.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17130288U JPH0292539U (en) | 1988-12-28 | 1988-12-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17130288U JPH0292539U (en) | 1988-12-28 | 1988-12-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0292539U true JPH0292539U (en) | 1990-07-23 |
Family
ID=31463014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17130288U Pending JPH0292539U (en) | 1988-12-28 | 1988-12-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0292539U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62123531A (en) * | 1985-11-25 | 1987-06-04 | Omron Tateisi Electronics Co | Cpu supervisory unit |
| JPS6395546A (en) * | 1986-10-13 | 1988-04-26 | Toshiba Corp | Detecting system for runaway of microprocessor |
-
1988
- 1988-12-28 JP JP17130288U patent/JPH0292539U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62123531A (en) * | 1985-11-25 | 1987-06-04 | Omron Tateisi Electronics Co | Cpu supervisory unit |
| JPS6395546A (en) * | 1986-10-13 | 1988-04-26 | Toshiba Corp | Detecting system for runaway of microprocessor |
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