JPS61201136U - - Google Patents
Info
- Publication number
- JPS61201136U JPS61201136U JP8094285U JP8094285U JPS61201136U JP S61201136 U JPS61201136 U JP S61201136U JP 8094285 U JP8094285 U JP 8094285U JP 8094285 U JP8094285 U JP 8094285U JP S61201136 U JPS61201136 U JP S61201136U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- reference voltage
- determination circuit
- reset
- cpu
- 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
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
Description
図は本考案の一実施例を示す回路図である。
１……ＣＰＵ、４……比較器（判定回路）、Ｃ
３……コンデンサ、Ｄ１……第２の充電回路を構
成するダイオード、Ｐ１……周期的パルスを送出
する出力ポート、Ｒ１９〜Ｒ２２……基準電圧発
生回路（抵抗分圧回路）を構成する抵抗、Ｒ２４
……第２の充電回路を構成する抵抗。
The figure is a circuit diagram showing an embodiment of the present invention. 1...CPU, 4...Comparator (judgment circuit), C
3 ...Capacitor, D1 ...Diode constituting the second charging circuit, P1 ...Output port that sends out periodic pulses, R19 to R22 ...Reference voltage generation circuit (resistance voltage divider circuit) Constituent resistance, R24
...Resistor that constitutes the second charging circuit.
Claims (1)
ンデンサの充放電を繰り返す充放電回路と、上記
コンデンサの端子電圧を判定した結果に基いてＣ
ＰＵにリセツト信号を送出する判定回路とを備え
たＣＰＵのリセツト回路において、上記判定回路
の出力を抵抗分圧回路を介して基準電圧入力端子
に帰還することにより当該判定回路の基準電圧レ
ベルを切り換える基準電圧発生回路と、判定回路
のリセツト信号出力電圧によつて前記コンデンサ
を充電または放電する第２の充電または放電回路
とを備えたことを特徴とするＣＰＵのリセツト回
路。 C
In a CPU reset circuit that includes a determination circuit that sends a reset signal to a PU, the reference voltage level of the determination circuit is switched by feeding back the output of the determination circuit to the reference voltage input terminal via a resistive voltage divider circuit. 1. A reset circuit for a CPU, comprising a reference voltage generation circuit and a second charging or discharging circuit that charges or discharges the capacitor using the reset signal output voltage of the determination circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8094285U JPS61201136U (en) | 1985-05-31 | 1985-05-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8094285U JPS61201136U (en) | 1985-05-31 | 1985-05-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61201136U true JPS61201136U (en) | 1986-12-17 |
Family
ID=30627265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8094285U Pending JPS61201136U (en) | 1985-05-31 | 1985-05-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61201136U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5771027A (en) * | 1980-10-21 | 1982-05-01 | Fujitsu Ten Ltd | Resetting circuit of microprocessor |
| JPS5837724A (en) * | 1981-08-28 | 1983-03-05 | Toshiba Corp | Reset circuit for microprocessor |
-
1985
- 1985-05-31 JP JP8094285U patent/JPS61201136U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5771027A (en) * | 1980-10-21 | 1982-05-01 | Fujitsu Ten Ltd | Resetting circuit of microprocessor |
| JPS5837724A (en) * | 1981-08-28 | 1983-03-05 | Toshiba Corp | Reset circuit for microprocessor |
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