JPS62112730U - - Google Patents
Info
- Publication number
- JPS62112730U JPS62112730U JP20304985U JP20304985U JPS62112730U JP S62112730 U JPS62112730 U JP S62112730U JP 20304985 U JP20304985 U JP 20304985U JP 20304985 U JP20304985 U JP 20304985U JP S62112730 U JPS62112730 U JP S62112730U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- chip microcomputer
- voltage
- supply voltage
- detection unit
- 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 6
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Microcomputers (AREA)
- Power Sources (AREA)
Description
第１図はこの考案のワンチツプマイクロコンピ
ユータのＲＡＭバツクアツプ回路の実施例の回路
図、第２図は第１図に示した各主要部の波形図、
第３図は給電電圧検出部の説明図、第４図は給電
電圧検出部の回路図である。
１…主電源、２…補助電源、３…ワンチツプマ
イクロコンピユータ、４…給電電圧検出部、５…
リセツト信号発生部。
Fig. 1 is a circuit diagram of an embodiment of the RAM backup circuit of the one-chip microcomputer of this invention, Fig. 2 is a waveform diagram of each main part shown in Fig. 1,
FIG. 3 is an explanatory diagram of the power supply voltage detection section, and FIG. 4 is a circuit diagram of the power supply voltage detection section. 1...Main power supply, 2...Auxiliary power supply, 3...One-chip microcomputer, 4...Power supply voltage detection unit, 5...
Reset signal generator.
Claims (1)
補助電源と、 前記主電源の電圧を検出しワンチツプマイクロ
コンピユータの動作を保障する給電電圧が動作保
障最小電圧値以上になつたときに動作保障電圧信
号を出力する給電電圧検出部と、 該給電電圧検出部より出力された動作保障電圧
信号を受けて前記ワンチツプマイクロコンピユー
タのイニシヤライズを行なうリセツト信号を出力
するリセツト信号発生部とを備えて構成したこと
を特徴とするワンチツプマイクロコンピユータの
ＲＡＭバツクアツプ回路。 ２ 前記リセツト信号発生部は、前記給電電圧検
出部より出力された動作保障電圧信号をコンデン
サに充電させることによりリセツト信号を出力す
ることを特徴とする実用新案登録請求の範囲第１
項に記載のワンチツプマイクロコンピユータのＲ
ＡＭバツクアツプ回路。[Scope of Claim for Utility Model Registration] 1. An auxiliary power supply for supplying power when the main power supply stops, and a supply voltage that detects the voltage of the main power supply and ensures the operation of the one-chip microcomputer, the minimum voltage value for which operation is guaranteed. a power supply voltage detection unit that outputs an operation guaranteed voltage signal when the power supply voltage detection unit exceeds the level above, and a reset unit that outputs a reset signal that initializes the one-chip microcomputer in response to the operation guaranteed voltage signal output from the power supply voltage detection unit. 1. A RAM backup circuit for a one-chip microcomputer, characterized in that it comprises a signal generating section. 2. The reset signal generating section outputs the reset signal by charging a capacitor with the operation guarantee voltage signal output from the power supply voltage detecting section.
R of the one-chip microcomputer described in
AM backup circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20304985U JPS62112730U (en) | 1985-12-27 | 1985-12-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20304985U JPS62112730U (en) | 1985-12-27 | 1985-12-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62112730U true JPS62112730U (en) | 1987-07-17 |
Family
ID=31168011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20304985U Pending JPS62112730U (en) | 1985-12-27 | 1985-12-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62112730U (en) |
-
1985
- 1985-12-27 JP JP20304985U patent/JPS62112730U/ja active Pending