JPS6218757U

JPS6218757U -

Info

Publication number: JPS6218757U
Application number: JP11118485U
Authority: JP
Priority date: 1985-07-19
Filing date: 1985-07-19
Publication date: 1987-02-04

Description

[Brief explanation of the drawing]

第１図は本考案実施例の暴走検出回路を含む装
置を示す概略図、第２図はそのマイクロコンピユ
ータの動作を示すフローチヤート、第３図及び第
４図はそれぞれ本実施例の暴走検出時の動作を示
すタイムチヤートである。４；マイクロコンピユータ、８；暴走検出回路
、Ｃ_１，Ｒ_１；第１の充放電回路、Ｃ_２，Ｒ_２，
Ｒ_３，Ｄ_１，ＩＮ_１；第２の充放電回路、ＡＮ_１；論理回路。 FIG. 1 is a schematic diagram showing a device including a runaway detection circuit according to an embodiment of the present invention, FIG. 2 is a flowchart showing the operation of the microcomputer, and FIGS. 3 and 4 are respectively at the time of runaway detection according to the present embodiment. This is a time chart showing the operation. 4; microcomputer, 8; runaway detection circuit, C ₁ , R ₁ ; first charging/discharging circuit, C ₂ , R ₂ ,
R ₃ , D ₁ , IN ₁ ; second charging/discharging circuit, AN ₁ ;Logic circuit.

Claims

[Claim for Utility Model Registration] In a runaway detection circuit of a microcomputer that outputs a pulse signal at a predetermined period under normal operation, a pulse signal from the microcomputer is input, and the pulse signal is output at a predetermined period. first and second charging and discharging circuits that repeat charging and discharging operations while the pulse signal is being output, and are charged or discharged to or above a predetermined level, respectively, when the pulse signal is no longer input normally; The output of the discharge circuit is input,
A runaway detection circuit for a microcomputer, comprising: a logic circuit that outputs an output signal when both outputs are charged or discharged to a predetermined level or higher;