JPH03127938U - - Google Patents
Info
- Publication number
- JPH03127938U JPH03127938U JP3564390U JP3564390U JPH03127938U JP H03127938 U JPH03127938 U JP H03127938U JP 3564390 U JP3564390 U JP 3564390U JP 3564390 U JP3564390 U JP 3564390U JP H03127938 U JPH03127938 U JP H03127938U
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- cpu
- voltage detection
- reset
- circuit
- 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
- 238000001514 detection method Methods 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000005856 abnormality Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Debugging And Monitoring (AREA)
Description
第１図は本考案のＣＰＵ監視回路の一実施例で
ある回路図である。第２図は第１図ＣＰＵ監視回
路の特定点の波形図である。
１…ＰＵ、２…電圧検出ＩＣ、３…スイツチン
グ回路、４…ロジツク回路、５…リセツト信号引
き延ばし回路、ＣＩ…コンデンサ。
FIG. 1 is a circuit diagram showing an embodiment of the CPU monitoring circuit of the present invention. FIG. 2 is a waveform diagram of a specific point of the CPU monitoring circuit of FIG. 1. 1...PU, 2...Voltage detection IC, 3...Switching circuit, 4...Logic circuit, 5...Reset signal extension circuit, CI...Capacitor.
Claims (1)
グ回路を介し、コンデンサの一端と電圧検出回路
の電圧検知端子とをそれぞれ接続し、前記コンデ
ンサの他端と電圧検出回路の負極側の端子は負極
端子に接続し、電圧検出回路の出力端子はＣＰＵ
のリセツト端子に接続し、ウオツチドツグ・タイ
マクリア端子としてリセツト中は入力状態、リセ
ツト解除後は出力状態となる前記ＣＰＵのクリア
端子を使用し、このクリア端子が入力中又はパル
ス制御中はオン、ＣＰＵ動作異常による単なる出
力中はオフとなるように前記スイツチング回路を
制御するジクロツ回路を前記クリア端子に接続し
て構成することにより、パワーオン・リセツト機
能とウオツチドツグ・タイマリセツト機能とを果
たすことを特徴としたＣＰＵ監視回路。 One end of the capacitor and the voltage detection terminal of the voltage detection circuit are each connected to the positive terminal that supplies power to the CPU via a switching circuit, and the other end of the capacitor and the negative terminal of the voltage detection circuit are connected to the negative terminal. The output terminal of the voltage detection circuit is
The CPU's clear terminal is connected to the reset terminal of the CPU and is in the input state during reset and output state after reset is used as the watchdog timer clear terminal.When this clear terminal is inputting or under pulse control, it is turned on and the CPU A power-on reset function and a watchdog timer reset function are achieved by connecting a logic circuit to the clear terminal to control the switching circuit so that it is turned off during mere output due to an operational abnormality. CPU monitoring circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3564390U JPH03127938U (en) | 1990-04-02 | 1990-04-02 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3564390U JPH03127938U (en) | 1990-04-02 | 1990-04-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03127938U true JPH03127938U (en) | 1991-12-24 |
Family
ID=31541178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3564390U Pending JPH03127938U (en) | 1990-04-02 | 1990-04-02 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03127938U (en) |
-
1990
- 1990-04-02 JP JP3564390U patent/JPH03127938U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS63198567U (en) | ||
| JPH03127938U (en) | ||
| JPH0445065Y2 (en) | ||
| JPS62179638U (en) | ||
| JPH0455610U (en) | ||
| JPS5844646U (en) | Dettman timer | |
| JPS61155928U (en) | ||
| JPH0196044U (en) | ||
| JPS62202021U (en) | ||
| JPS62151223U (en) | ||
| JPS6430416U (en) | ||
| JPH0322417U (en) | ||
| JPS61112460U (en) | ||
| JPH022735U (en) | ||
| JPH0290538U (en) | ||
| JPH0386432U (en) | ||
| JPS62169898U (en) | ||
| JPH05290187A (en) | Low-power-consumption microcomputer operation system | |
| JPS63187019U (en) | ||
| JPS62134149U (en) | ||
| JPS62188826U (en) | ||
| JPH0328813U (en) | ||
| JPS6152439U (en) | ||
| JPS62117649U (en) | ||
| JPH01144880U (en) |