KR890003753Y1 - Automatic reset circuit in micro computer - Google Patents

Automatic reset circuit in micro computer Download PDF

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KR890003753Y1
KR890003753Y1 KR2019860011020U KR860011020U KR890003753Y1 KR 890003753 Y1 KR890003753 Y1 KR 890003753Y1 KR 2019860011020 U KR2019860011020 U KR 2019860011020U KR 860011020 U KR860011020 U KR 860011020U KR 890003753 Y1 KR890003753 Y1 KR 890003753Y1
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transistor
microcomputer
capacitor
reset circuit
resistor
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KR2019860011020U
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KR880003056U (en
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이병희
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주식회사 금성사
구자학
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/24Resetting means
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K3/00Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/26Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
    • H03K3/28Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
    • H03K3/281Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
    • H03K3/286Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable
    • H03K3/2865Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable ensuring a predetermined initial state when the supply voltage has been applied; storing the actual state when the supply voltage fails

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Electronic Switches (AREA)

Abstract

내용 없음.No content.

Description

마이콤의 오동작시 자동 리세트회로Automatic reset circuit in case of malfunction of microcomputer

제1도는 본 고안의 자동 리세트회로도.1 is an automatic reset circuit diagram of the present invention.

제2도는 제1도의 각부의 파형도.2 is a waveform diagram of each part of FIG.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 초기리세트회로 2 : 마이콤1: Initial reset circuit 2: Microcomputer

TR1~TR3: 트랜지스터 C1~C4: 콘덴서TR 1 to TR 3 : transistor C 1 to C 4 : condenser

D1,D2: 다이오드 R1~R10:저항D 1 , D 2 : Diodes R 1 to R 10 : Resistance

ZD1: 정전압 다이오드ZD 1 : constant voltage diode

본 고안은 각종 전자제품 및 제어장치 등에 사용되는 마이콤에 있어서, 미이콤이 오동작 할 경우에 자동으로 마이콤으로 리세트시키게 한 마이콤의 오동작시 자동 리세트회로에 관한 것이다.The present invention relates to an automatic reset circuit in the case of a malfunction of a microcomputer, which is automatically reset to a microcomputer in the case of a microcomputer used in various electronic products and control devices.

종래에는 마이콤에 초기리세트회로를 접속하여 전원이 인가되는 초기시간에만 마이콤을 리세트시키게 구성하였으므로 마이콤이 정상적으로 동작하는 상태에서 외부잡음 및 충격등에 의하여 오동작을 하게되면, 사용자는 마이콤에 인가되는 전원을 차단시킨 후 다시 인가하여 마이콤을 리세트시켜야 되는 결함이 있었다.In the related art, the initial reset circuit is connected to the microcomputer to reset the microcomputer only at the initial time when the power is applied. If the microcomputer malfunctions due to external noise and impact while the microcomputer is operating normally, There was a defect that must be reset and then applied again to reset the microcomputer.

본 고안은 이와같은 종래의 결함을 감안하여, 마이콤이 정상동작할 경우에 출력시키는 펄스신호를 이용하여 마이콤이 오동작할 때 자동을 리세트시키게 안출한 것으로, 이를 첨부된 도면에 의하여 상세히 설명하면 다음과 같다.The present invention is designed to reset automatically when the microcomputer malfunctions by using a pulse signal output when the microcomputer is operating normally, in view of the conventional defects described above. Same as

제1도에 도시한 바와같이 전원단자 (Vcc)를 정전압 다이오드(ZD1)을 통해 저항(R1)에 접속함과 아울러 그 접속점을 저항(R2)을 통해 콘덴서(C1) 및 트랜지스터(TR1)의 베이스에 접속하고, 트랜지스터(TR1)의 콜렉터는 저항(R3)에 접속함과 아울러 저항(R4)을 통해 콘덴서(C2)에 접속하여 초기리세트회로(1)를 구성하고, 초기리세트회로(1)의 출력단자인 저항(R4) 및 콘덴서(C2)의 접속점은 마이콤(2)의 리세트단자(RST)에 접속하여, 마이콤(2)의 정상동작신호출력단자(MD)를 다이오드 (D1) 및 저항(R5)을 통해 저항(R6) 및 트랜지스터(TR2)의 베이스에 접속하고, 트랜지스터(TR2)의 콜렉터는 저항(R8)에 접속함과 아울러 그 접속점을 저항(R7) 및 접지콘덴서(C4), 다이오드 (D2)를 통해서는 접지콘덴서(C3)에 접속하고, 저항(R9)을 통해서는 저항(R10) 및 트랜지스터 (TR5)의 베이스에 접속하여 트랜지스터(TR3)의 콜렉터를 상기 초기리세트회로(1)의 저항(R2) 및 트랜지스터(TR1)의 베이스, 콘덴서(C1)의 접속점에 접속한 것으로, 상기에서 정상 동작신호 출력단자(MD)는 마이콤(2)이 정상동작할 경우에 펄스신호가 출력되는 단자이다.As shown in FIG. 1, the power supply terminal Vcc is connected to the resistor R 1 through the constant voltage diode ZD 1 , and the connection point is connected to the capacitor C 1 and the transistor through the resistor R 2 . TR 1 ), the collector of transistor TR 1 is connected to resistor R 3 , and is connected to capacitor C 2 through resistor R 4 to reset initial reset circuit 1. The connection point of the resistor R 4 and the capacitor C 2 , which are the output terminals of the initial reset circuit 1, is connected to the reset terminal RST of the microcomputer 2 so that the normal operation of the microcomputer 2 is performed. The signal output terminal MD is connected to the resistor R 6 and the base of the transistor TR 2 via a diode D 1 and a resistor R 5 , and the collector of the transistor TR 2 is a resistor R 8 . In addition, the connection point is connected to a ground capacitor (C 3 ) through a resistor (R 7 ), a ground capacitor (C 4 ), a diode (D 2 ), and a resistor (R) through a resistor (R 9 ). 10) and The collector of the transistor the transistor (TR 3) and connected to the base of (TR 5) to the connection point of the base, a capacitor (C 1) of the resistance (R 2) and a transistor (TR 1) of the initial reset circuit (1) In this connection, the normal operation signal output terminal MD is a terminal for outputting a pulse signal when the microcomputer 2 operates normally.

이와같이 구성된 본 고안의 작용효과를 상세히 설명하면 다음과 같다.Referring to the effects of the present invention configured in this way in detail as follows.

전원단자(Vcc)에 전원이 인가되면 그 전원은 마이콤(2)의 전원입력단자(Vi)에 입력됨과 아울러 정전압다이오드(ZD1) 및 저항(R2)을 통해 제2도의 (가)에 도시한 바와 같이 콘덴서(C1)에 충전되기 시작하고, 이때, 콘덴서(C1)에 충전된 전압이 트랜지스터(TR1)의 드레시홀드 전압(VTH1)이상이 되기 전가지는 트랜지스터(TR1)가 오프되므로 전원단자(Vcc)의 전원이 저항(R3)(R4)을 통해 콘덴서(C2)에 충전되면서 마이콤(2)의 제2(b)도에 도시한 바와 같이 리세트단자(RST)에 고전위가 인가되어 마이콤(2)은 리세트된다.When power is applied to the power terminal Vcc, the power is inputted to the power input terminal Vi of the microcomputer 2 and shown in FIG. 2A through the constant voltage diode ZD 1 and the resistor R 2 . As described above, the capacitor C 1 starts to be charged, and at this time, the transistor TR 1 is until the voltage charged in the capacitor C 1 becomes equal to or greater than the threshold voltage V TH1 of the transistor TR 1 . Since the power of the power supply terminal Vcc is turned off, the capacitor C 2 is charged through the resistor R 3 (R 4 ), and the reset terminal RST as shown in FIG. 2 (b) of the microcomputer 2 is turned off. Is applied to the microcomputer 2 so that the microcomputer 2 is reset.

이와같은 상태에서 일정시간이 경과하여 콘덴서(C1)에 충전된 전압이 트랜지스터(TR1)의 드레시홀드 전압(VTH1)이상이 되면, 트랜지스터(TR1)가 온되어 전원단자(Vcc)의 전원이 저항(R3) 및 트랜지스터(TR1)를 통해 접지로 흐르게 되고, 마이콤(2)의 리세트단자(RST)에는 제2(b)도에 도시한 바같이 저전위가 인가되어 마이콤(2)은 동작을 시작하게 된다.Thus if the same state at a predetermined time by the capacitor threshold voltage (V TH1) or more of the voltage and the transistor (TR 1) filled in the (C 1) in, is a transistor (TR 1) on the power supply terminal (Vcc) The power supply flows to the ground through the resistor R 3 and the transistor TR 1 , and a low potential is applied to the reset terminal RST of the microcomputer 2 as shown in FIG. 2) starts the operation.

이와같이 전원단자(Vcc)에 전원이 인가된 초기시간에 마이콤(2)이 리세트된 후 동작을 시작하는 상태에서 마이콤(2)이 정상동작을 하면, 마이콤(2)의 정상 동작신호 출력단자(MD)에는 제2(c)도에 도시한 바와같이 펄스신호가 출력되어 다이오드(D1)를 통해 제2(d)도에 도시한 바와같이 콘덴서(C3)에 충전되고, 그 콘덴서(C3)에 충전된 전압이 트랜지스터(TR2)의 드레시홀드 전압(VTH2)이상이 되면 트랜지스터(TR2)가 온되어 전원단자(Vcc)의 전원이 저항(R8) 및 트랜지스터(TR2)를 통해 접지로 흐르게 되고, 트랜지스터(TR3)의 베이스에는 저전위가 인가되어 오프되므로 콘덴서(C1)에는 계속 고전위가 충전되어 트랜지스터(TR1)는 온되고, 마이콤(2)의 리세트단자(RST)에는 저전위가 인가된다.In this way, if the microcomputer 2 operates normally with the microcomb 2 being reset at the initial time when power is supplied to the power supply terminal Vcc, and the microcomb 2 operates normally, the normal operation signal output terminal of the microcom 2 ( In the MD, a pulse signal is output as shown in FIG. 2 (c) and charged to the capacitor C 3 as shown in FIG. 2 (d) via the diode D 1 , and the capacitor C 3) If the voltage is the threshold voltage (V TH2) over the transistor (TR 2) filled in the transistor (TR 2) is turned on the power source of the power supply terminal (Vcc) resistor (R 8) and a transistor (TR 2) Through the ground, the low potential is applied to the base of the transistor TR 3 and turned off, so that the capacitor C 1 continues to be charged with high potential so that the transistor TR 1 is turned on, and the reset of the microcomputer 2 is performed. Low potential is applied to the terminal RST.

이와같은 상태에서 시간(t1)에 마이콤(2)이 오동작을 하여 제2(c)도에 도시한 바와같이 마이콤(2)의 정상동작신호 출력단자(MD)에 저전위가 출력되면, 제2(d)도에 도시한 바와같이 콘덴서(C3)에 충전된 전압이 저항( R5)(R6)을 통해 방전하기 시작하고, 콘덴서(C3)에 충전된 전압이 트랜지스터(TR2)의 드레시홀드 전압(VTHK2)이하로 방전하면, 트랜지스터(TR2)가 오프되어 전원단자(Vcc)의 전원이 저항(R8)(R9)을 통해 제2(e)도에 도시한 바와같이 트랜지스터(TR3)의 베이스에 고전위를 인가하게 되므로 트랜지스터(TR3)을 통해 순식간에 방전하게 된다.In this state, if the microcomputer 2 malfunctions at time t 1 and a low potential is output to the normal operation signal output terminal MD of the microcomputer 2 as shown in FIG. 2 (d) a capacitor (C 3) a voltage charged to the voltage begins to discharge through a resistor (R 5) (R 6) charging, and a capacitor (C 3) to transistors (TR 2, as shown in Fig. When discharged below the threshold voltage V THK2 , the transistor TR 2 is turned off so that the power supply of the power supply terminal Vcc is turned through the resistors R 8 (R 9 ) as shown in FIG. since it is a high potential to the base of the transistor (TR 3), as is discharged quickly through the transistor (TR 3).

따라서, 트랜지스터(TR1)는 오프되고, 전원단자(Vcc)의 전원이 저항( R3)(R4)을 통해 제2(b)도에 도시한 바와같이 마이콤(2)의 리세트단자(RST에 고전위를 인가하게 되므로 마이콤(2)은 리세트된다.Therefore, the transistor TR 1 is turned off, and the power supply of the power supply terminal Vcc is connected to the reset terminal of the microcomputer 2 as shown in FIG. 2 (b) through the resistors R 3 and R 4 . Since the high potential is applied to the RST, the microcomputer 2 is reset.

이와같은 상태에서 시간(t2)에 마이콤(2)이 정상동작을 하여 그의 정상 동작신호 출력단자(MD)에 제2(c)도에 도시한 바와같이 펄스신호가 출력되면, 그 출력된 펄스신호는 다이오드(D1)를 통해 제2(d)도에 도시한 바와같이 콘덴서(C3)에 충전되고 그 충전된 전압이 트랜지스터(TR2)의 드레시홀드 전압이상이 되면 트랜지스터 (TR2)가 온되어 제2(e)도에 도시한 바와같이 트랜지스터(TR3)의 베이스에 저전위가 인가되므로 트랜지스터(TR3)는 오프된다.In this state, when the microcomputer 2 operates normally at time t 2 and a pulse signal is output to its normal operation signal output terminal MD as shown in FIG. 2 (c), the output pulse signal diode of claim 2 (d) as shown in Fig. was charged in the capacitor (C 3) that when a charged voltage is the threshold voltage than the transistor (TR 2) the transistor (TR 2) through (D 1) Since the transistor is turned on and a low potential is applied to the base of the transistor TR 3 as shown in FIG. 2 (e), the transistor TR 3 is turned off.

따라서, 콘덴서(C1)에는 제2(a)도에 도시한 바와같이 전원단자(Vcc)의 전원이 정전압 다이오드(ZD1) 및 저항(R2)을 통해 충전되고, 그 충전된 전압이 트랜지스터(TR1)의 드레시홀드 전압(VTH2)이상이 되면 트랜지스터(TR1)가 온되므로 제2(b)도에 도시한 바와같이 마이콤(2)의 리세트단자(RST)에는 저전위가 인가되어 마이콤(2)은 다시 동작을 시작하게 된다.Therefore, the capacitor C 1 is charged with the power of the power supply terminal Vcc through the constant voltage diode ZD 1 and the resistor R 2 as shown in FIG. 2 (a), and the charged voltage is stored in the transistor. Since the transistor TR 1 is turned on when the threshold voltage V TH2 of TR 1 is equal to or higher, a low potential is applied to the reset terminal RST of the microcomputer 2 as shown in FIG. The microcomputer 2 then starts operation again.

그리고, 상기에서 콘덴서(C4)는 마이콤(2)이 오동작을 하여 트랜지스터(TR2)가 오프된 후 다시 온될때 전원단자(Vcc)의 전원을 저항(R8)(R7)을 통해 충전시키면서 다이오드(D2)를 통해 콘덴서(C3)에 인가하여 콘덴서(C3)에 충전된 전압이 빠른 시간내에 트랜지스터(TR2)의 드레시홀드 전압이상이 되게하는 역할을 한다.The capacitor C 4 charges the power of the power supply terminal Vcc through the resistors R 8 and R 7 when the microcomputer 2 malfunctions and is turned on after the transistor TR 2 is turned off. While the voltage is applied to the capacitor C 3 through the diode D 2 , the voltage charged in the capacitor C 3 becomes higher than or equal to the threshold voltage of the transistor TR 2 within a short time.

이상에서 설명한 바와같이 본 고안은 마이콤(2)이 오동작할 경우에 자동으로 리세트시키므로 마이콤(2)이 오동작할 때 마이콤(2)에 인가되는 전원을 차단시킨 후 다시 전원이 인가되게 해야되는 번거로움을 제거할 수 있는 효과가 있다.As described above, the present invention automatically resets the microcomputer 2 when it malfunctions. Therefore, when the microcomputer 2 malfunctions, the power supply to the microcomputer 2 should be cut off and then the power should be applied again. It has the effect of eliminating roaming.

Claims (1)

트랜지스터(TR1) 및 저항(R1~R4), 콘덴서(C1,C2), 정전압 다이오드(ZD1)로 된 초기리세트회로(1)가 마이콤(2)의 리세트단자(RST)에 접속된 마이콤의 리세트회로에 있어서, 마이콤(2)의 정상 동작신호 출력단자(MD)를 다이오드(D1)를 통해 콘덴서(C3) 및 트랜지스터(TR2)의 베이스측에 접속하여 트랜지스터(TR2)의 콜렉터를 트랜지스터(TR3)의 베이스에 접속하고, 트랜지스터(TR3)의 콜렉터는 상기 트랜지스터(TR1)의 베이스 및 저항(R2), 콘덴서(C1)의 접속점에 접속하여 구성함을 특징으로 하는 마이콤의 오동작시 자동 리세트회로.An initial reset circuit 1 composed of transistors TR 1 , resistors R 1 to R 4 , capacitors C 1 and C 2 , and constant voltage diodes ZD 1 has a reset terminal RST of the microcomputer 2. ) it is determined in the reset circuit of the microcomputer, to the normal operation signal output terminal (MD) of the microcomputer (2) via a diode (D 1) connected to the base terminal of the capacitor (C 3) and a transistor (TR 2) connected to the the connection point of the transistor (TR 2) connected to the collector of the base of the transistor (TR 3) and the collector of the transistor (TR 3) includes a base and a resistor (R 2) of said transistor (TR 1), a capacitor (C 1) Automatic reset circuit in case of malfunction of the microcomputer, characterized in that the connection is configured.
KR2019860011020U 1986-07-26 1986-07-26 Automatic reset circuit in micro computer KR890003753Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2019860011020U KR890003753Y1 (en) 1986-07-26 1986-07-26 Automatic reset circuit in micro computer

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Application Number Priority Date Filing Date Title
KR2019860011020U KR890003753Y1 (en) 1986-07-26 1986-07-26 Automatic reset circuit in micro computer

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KR880003056U KR880003056U (en) 1988-04-11
KR890003753Y1 true KR890003753Y1 (en) 1989-06-02

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KR2019860011020U KR890003753Y1 (en) 1986-07-26 1986-07-26 Automatic reset circuit in micro computer

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