JPH0478623U - - Google Patents
Info
- Publication number
- JPH0478623U JPH0478623U JP11968590U JP11968590U JPH0478623U JP H0478623 U JPH0478623 U JP H0478623U JP 11968590 U JP11968590 U JP 11968590U JP 11968590 U JP11968590 U JP 11968590U JP H0478623 U JPH0478623 U JP H0478623U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- reset
- power
- terminal
- power supply
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 5
- 230000002265 prevention Effects 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 3
- 230000014759 maintenance of location Effects 0.000 claims 1
Landscapes
- Microcomputers (AREA)
Description
図示した回路は、本考案のリセツト装置の一実
施例である。
主な図番の説明、１……マイクロコンピユータ
ー、２……電源端子、３……制御端子、４……リ
セツト端子、７……電源回路、９……逆流防止用
ダイオード、１０……バツクアツプ用コンデンサ
ー、１２……バツクアツプモード切換回路、１７
……スイツチングトランジスター、１９……リセ
ツト用トランジスター、２３……時定数回路。
The illustrated circuit is one embodiment of the reset device of the present invention. Explanation of main drawing numbers, 1... Microcomputer, 2... Power terminal, 3... Control terminal, 4... Reset terminal, 7... Power supply circuit, 9... Diode for backflow prevention, 10... For backup Capacitor, 12...Backup mode switching circuit, 17
... Switching transistor, 19 ... Resetting transistor, 23 ... Time constant circuit.
Claims (1)
込まれていることともに前記発振回路の動作・不
動作を制御する制御端子、前記リセツト回路の動
作・不動作を制御するリセツト端子及び動作電圧
が印加される電源端子を有するマイクロコンピユ
ーターにおいて、前記マイクロコンピユーターの
電源端子に逆流防止用ダイオードを介して電源を
供給する電源回路と、前記電源端子に抵抗を介し
て一端が接続されているとともに他端が接地され
、且つ前記メモリー回路にバツクアツプ用電源を
供給するバツクアツプ用コンデンサーと、前記電
源回路よりマイクロコンピユーターへ電源が供給
されたとき動作状態になるとともに前記制御端子
に発振回路を動作状態にせしめる信号を印加せし
めるバツクアツプモード切換回路と、前記バツク
アツプ用コンデンサーの充電電圧を検出するべく
接続されているとともに該バツクアツプ用コンデ
ンサーの充電電圧がメモリー回路の記憶保持動作
を行なうために必要な電圧値より低下した状態に
あるとき前記電源回路より電源が供給されると導
通状態になるスイツチングトランジスターと、該
スイツチングトランジスターのエミツタ・コレク
タ間を通してバイアス電流が供給されるとともに
導通状態にあるとき前記リセツト端子にリセツト
信号を印加せしめるリセツト用トランジスターと
、該リセツト用トランジスターのベース回路に接
続されているとともに前記スイツチングトランジ
スターの非導通状態への反転動作時前記リセツト
用トランジスターを所定時間導通状態に保持する
時定数回路とより成るマイクロコンピユーターの
リセツト装置。 In addition to incorporating an oscillation circuit, a memory circuit, and a reset circuit, it also includes a control terminal for controlling the operation/non-operation of the oscillation circuit, a reset terminal for controlling the operation/non-operation of the reset circuit, and a power source to which an operating voltage is applied. In a microcomputer having a terminal, a power supply circuit supplies power to the power supply terminal of the microcomputer through a backflow prevention diode, one end is connected to the power supply terminal via a resistor, and the other end is grounded; and a backup capacitor that supplies backup power to the memory circuit, and a backup capacitor that becomes operational when power is supplied to the microcomputer from the power supply circuit and applies a signal to the control terminal to activate the oscillation circuit. The backup mode switching circuit is connected to detect the charging voltage of the backup capacitor, and the charging voltage of the backup capacitor is lower than the voltage value required for the memory circuit to perform a memory retention operation. A bias current is supplied between the switching transistor, which becomes conductive when power is supplied from the power supply circuit, and the emitter and collector of the switching transistor, and when the transistor is in the conductive state, a reset signal is applied to the reset terminal. a time constant circuit that is connected to the base circuit of the reset transistor and holds the reset transistor in a conductive state for a predetermined period of time when the switching transistor is inverted to a non-conductive state. Microcomputer reset device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11968590U JPH0751628Y2 (en) | 1990-11-14 | 1990-11-14 | Microcomputer reset device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11968590U JPH0751628Y2 (en) | 1990-11-14 | 1990-11-14 | Microcomputer reset device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0478623U true JPH0478623U (en) | 1992-07-09 |
| JPH0751628Y2 JPH0751628Y2 (en) | 1995-11-22 |
Family
ID=31867628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11968590U Expired - Lifetime JPH0751628Y2 (en) | 1990-11-14 | 1990-11-14 | Microcomputer reset device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0751628Y2 (en) |
-
1990
- 1990-11-14 JP JP11968590U patent/JPH0751628Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0751628Y2 (en) | 1995-11-22 |
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