JPH0415719U - - Google Patents
Info
- Publication number
- JPH0415719U JPH0415719U JP5491190U JP5491190U JPH0415719U JP H0415719 U JPH0415719 U JP H0415719U JP 5491190 U JP5491190 U JP 5491190U JP 5491190 U JP5491190 U JP 5491190U JP H0415719 U JPH0415719 U JP H0415719U
- Authority
- JP
- Japan
- Prior art keywords
- threshold voltage
- circuit
- power supply
- voltage
- 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
Description
第１図は本考案回路を示す回路図、第２図は第
１図の動作を示すタイミングチヤートである。
１……マイクロコンピユータ、４……閾値電圧
発生回路、５……比較回路、１０……分周回路、
１１，１２……ＡＮＤゲート、１３……ＯＲゲー
ト。
FIG. 1 is a circuit diagram showing the circuit of the present invention, and FIG. 2 is a timing chart showing the operation of FIG. 1. 1... Microcomputer, 4... Threshold voltage generation circuit, 5... Comparison circuit, 10... Frequency dividing circuit,
11, 12...AND gate, 13...OR gate.
Claims (1)
動作するマイクロコンピユータにおいて、 マイクロコンピユータが動作可能な閾値電圧を
発生する閾値電圧発生回路と、 前記電源電圧の状態と前記閾値電圧とを比較す
る比較回路と、 発振回路の発振クロツクを所定の分周クロツク
に分周する分周回路と、 前記電源電圧の状態が前記閾値電圧より大の時
の前記比較回路の比較信号によつて前記発信クロ
ツクを切換出力し、且つ、前記電源電圧の状態が
前記閾値電圧より小の時の前記比較回路の比較信
号によつて前記分周クロツクを切換出力する切換
回路と、 を備えたことを特徴とするマイクロコンピユータ
のクロツク切換回路。 (2) 閾値電圧発生回路はコンデンサを備え、該
コンデンサの端子電圧に基づいて閾値電圧を発生
することを特徴とする請求項(1)記載のマイクロ
コンピユータのクロツク切換回路。[Claims for Utility Model Registration] (1) In a microcomputer that operates based on a power supply voltage obtained from a commercial power supply, a threshold voltage generation circuit that generates a threshold voltage at which the microcomputer can operate; and a state of the power supply voltage; A comparison circuit that compares the voltage with the threshold voltage, a frequency division circuit that divides the oscillation clock of the oscillation circuit into a predetermined frequency-divided clock, and a comparison of the comparison circuit when the state of the power supply voltage is higher than the threshold voltage. a switching circuit that switches and outputs the transmission clock according to a signal, and switches and outputs the frequency-divided clock according to a comparison signal of the comparison circuit when the state of the power supply voltage is lower than the threshold voltage; A clock switching circuit for a microcomputer characterized by the following features: (2) The clock switching circuit for a microcomputer according to claim 1, wherein the threshold voltage generation circuit includes a capacitor and generates the threshold voltage based on the terminal voltage of the capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5491190U JPH0415719U (en) | 1990-05-25 | 1990-05-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5491190U JPH0415719U (en) | 1990-05-25 | 1990-05-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0415719U true JPH0415719U (en) | 1992-02-07 |
Family
ID=31577395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5491190U Pending JPH0415719U (en) | 1990-05-25 | 1990-05-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0415719U (en) |
-
1990
- 1990-05-25 JP JP5491190U patent/JPH0415719U/ja active Pending
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