KR890000411Y1 - Reset circuit of micro processor - Google Patents
Reset circuit of micro processor Download PDFInfo
- Publication number
- KR890000411Y1 KR890000411Y1 KR2019850015593U KR850015593U KR890000411Y1 KR 890000411 Y1 KR890000411 Y1 KR 890000411Y1 KR 2019850015593 U KR2019850015593 U KR 2019850015593U KR 850015593 U KR850015593 U KR 850015593U KR 890000411 Y1 KR890000411 Y1 KR 890000411Y1
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- South Korea
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- microprocessor
- reset
- voltage
- resistor
- transistor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/24—Resetting means
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/26—Generators 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
- H03K3/28—Generators 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
- H03K3/281—Generators 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
- H03K3/286—Generators 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
- H03K3/2865—Generators 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
제1도는 본 고안의 회로도이다.1 is a circuit diagram of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
TR1: 트랜지스터 D : 람다다이오드TR 1 : Transistor D: Lambda Diode
Vcc : 마이크로프로세서의 전원 단자Vcc: Power Terminal of Microprocessor
RESET : 마이크로프로세서의 리셋트단자RESET: Reset terminal of microprocessor
SW : 리셋트스위치SW: reset switch
본 고안은 마이크로프로세서의 리셋트 회로에 관한 것으로, 특히 마이크로프로세서의 전원스위치를 온상태로 하여 초기전원을 공급할때 마이크로프로세서에 공급되는 전원이 안정된 상태로 될때까지 마이크로프로세서를 리셋트 상태로 만들어 전압인가에 따른 오동작을 방지하도록 한 마이크로 프로세서의 리셋트 회로에 관한 것이다.The present invention relates to a reset circuit of the microprocessor, and in particular, when the initial power is supplied by turning on the power switch of the microprocessor, the microprocessor is reset until the power supplied to the microprocessor is stable. It relates to a reset circuit of the microprocessor to prevent malfunction due to the application.
일반적으로 마이크로프로세서의 전원공급회로에서는 전원 스위치를 온상태로 하면 마이프로프로세서에 공급되는 전원전압은 순간적으로 정격전압까지 증가되지않고 서서히 증가하게 되는데, 통상 CMOS를 사용하는 마이크로프로세서의 정격전압은 5±0.5[V]로 되어 있기 때문에 마이크로프로세서는 전원전압이 4.5[V]가 될때까지는 확실한 동작을 하지 못하게되고, 마이크로프로세서에 쉬미트트리거(Schmidt Trigger)와 풀업(Pull-up)저항이 내장되어 있는 경우에는 마이크로프로세서의 리셋트 입력단에 저항과 콘덴서로 구성된 시정수회로에 의해 리셋트를 실행하고 있는바, 상기의 방법은 콘덴서에 일정 전압이 충전되어야만 마이크로프로세서를 리셋트 시켜주게 되므로, 전원전압이 인가되기 전에 리셋트전압이 풀리거나 전원스위치의 리셋트 시정수보다 빠른 온·오프 동작에 대하여는 마이크로프로세서의 안정된 동작에 필요한 리셋트 동작이 이루어지지않게 된다는 결점이 있었다.In general, in the power supply circuit of the microprocessor, when the power switch is turned on, the power voltage supplied to the microprocessor does not increase to the rated voltage instantaneously but gradually increases. In general, the rated voltage of the microprocessor using CMOS is 5 ± 0.5 [V], the microprocessor will not operate reliably until the supply voltage reaches 4.5 [V]. The microprocessor has a built-in Schmidt Trigger and pull-up resistor. If there is, the reset is performed by a time constant circuit composed of a resistor and a capacitor at the reset input terminal of the microprocessor. In the above method, the microprocessor is reset only when a constant voltage is charged in the capacitor. Before this is applied, the reset voltage is released or is shorter than the reset time constant of the power switch. Turning on and there was a defect that the reset operation required for the stable operation of the microprocessor with respect to the off-operation does not occur.
본 고안은 상기한 문제점을 개선하기 위한 것으로, 마이크로프로세서의 리셋트 단자에다 람다이오드(diode)와 트랜지스터등을 연결하므로서 람다다이오드의 전압제어형 부저항특성을 이용하여 초기전원에 대한 안정된 리셋트 동작은 물론, 전원스위치의 빠른 온, 오프 동작에 대해서는 일정 전원이 될때까지 마이크로프로세서를 리셋트 시켜 주므로써 마이크로 프로세서의 오동작을 방지하여 신뢰성을 높여주도록된 마이크로프로세서의 리셋트 회로를 제공하는데 그 목적이 있다.The present invention is to solve the above problems, and by using a voltage-controlled negative resistance characteristic of the lambda diode by connecting a diode and a transistor to the reset terminal of the microprocessor stable reset operation for the initial power supply Of course, the purpose of the present invention is to provide a reset circuit for a microprocessor which is designed to prevent the microprocessor from malfunctioning by increasing the reliability of the power switch for fast on / off operation. .
이하 본 고안의 구성 및 작용, 효과를 예시도면에 의거하여 상세히 설명하면 다음과 같다.Hereinafter, the configuration, operation, and effects of the present invention will be described in detail with reference to the accompanying drawings.
본 고안은 전원(B+)단자에 람다다이오드(D)와 저항(R1)이 직렬로 연결됨과 더불어 저항(R2)과 마이크로프로세서(MP)의 전원입력단자(Vcc)가 병렬로 연결되고, 상기 람다다이오드(D)와 저항(R1)의 접속점에는 트랜지스터(TR1)의 베이스가 연결되며, 상기 트랜지스터 (TR1)의 컬렉터에는 저항(R2)과 콘덴서(C), 레셋트스위치(SW)및 마이크로프로세서(MP)의 리셋트 단(RESET)이 연결된 구조로 되어 있다.According to the present invention, the lambda diode (D) and the resistor (R1) are connected in series to the power (B +) terminal, and the power input terminal (Vcc) of the resistor (R2) and the microprocessor (MP) is connected in parallel, and the lambda The base of the transistor TR1 is connected to the junction of the diode D and the resistor R1, and the collector of the transistor TR1 is a resistor R2, a capacitor C, a reset switch SW and a microprocessor ( It has a structure in which the reset stage of MP) is connected.
제1도는 상기한 구조로 되어 있는 본 고안의 회로도로서, 전원스위치를 턴, 온시키면 마이크로프로세서의 전원입력단자(Vcc)에 공급되는 전원전압은 서서히 증가하게 됨과 동시에 람다다이오드(D)에도 전압이 인가된다. 여기서, 람다다이오드(D)는 N채널과 P채널의 전계효과트랜지스터(FET)가 직렬접속된 구조로 되어 있고, 그의 전류-전압특성은 최초의 전압이 작은 동안에는 전압의 증가에 따라 전류가 증가하지만, 전압을 적정레벨 이상으로 증가시키면 전류가 감소하게 되어 핀치오프(Pinch-off)되는 전압제어형 부성저항을 갖는다.FIG. 1 is a circuit diagram of the present invention having the above-described structure. When the power switch is turned on and on, the power supply voltage supplied to the power input terminal Vcc of the microprocessor is gradually increased and the voltage is also applied to the lambda diode D. Is approved. Here, the lambda diode (D) has a structure in which field effect transistors (FETs) of N and P channels are connected in series, and its current-voltage characteristic increases with increasing voltage while the initial voltage is small. Increasing the voltage above the proper level causes the current to decrease, and has a voltage-controlled negative resistance that is pinched off.
따라서, 람다다이오드(D)는 최초에 공급되는 전압이 증가함에 따라 전류가 증가하여 트랜지스터(TR1)의 베이스에 전압이 인가되므로 트랜지스터(TR1)는 턴온되며, 이에따라 콘덴서(C)는 방전하게 된다. 그러므로 마이크로프로세서(MP)의 리셋트단(RESET)은 낮은 전위로 되어 리셋트 상태를 유지하게 된다. 다음에는 람다다이오드(D)에 공급되는 전압이 핀치오프점가지 되면 전류가 감소하게되어 람다다이오드(D)는 오프상태로되로, 이에따라 트랜지스터(TR1)도 턴, 오프되며, 콘덴서(C)는 저항(R2)을 통하여 충전된다.Therefore, the lambda diode D has a current applied as the voltage initially supplied increases, and a voltage is applied to the base of the transistor TR 1 , so that the transistor TR1 is turned on, and thus the capacitor C is discharged. . Therefore, the reset stage RESET of the microprocessor MP is at a low potential to maintain the reset state. Next, when the voltage supplied to the lambda diode D reaches the pinch-off point, the current decreases so that the lambda diode D is turned off. Accordingly, the transistor TR1 is turned off and off, and the capacitor C is a resistor. It is charged via (R2).
따라서, 콘덴서(C)의 충전전압이 일정전위로 되면 마이크로프로세서(MP)의 리셋트(RESET)단에는 높은 전위의 전압이 인가되어 리셋트가 헤제되고, 마이크로프로세서(MP)는 정격전압상태에서 안정된 동작을 할수 있게 된다. 여기서 리셋트스위치(SW)는 외부에서 마이크로프로세서(MP)를 인위적으로 리셋트 시키기 위하여 설치된다.Therefore, when the charging voltage of the condenser C reaches a constant potential, a high potential voltage is applied to the reset terminal of the microprocessor MP, and the reset is canceled. Stable operation is possible. Here, the reset switch SW is installed to artificially reset the microprocessor MP from the outside.
한편, 전원스위치를 빈번하게 온, 오프시키는 경우에 있어서, 람다다이오드(D)에 공급되는 전압이 핀치오프점에 될때까지는 마이크로프로세서(MP)의 리셋트(RESET)단에 낮은 전위가 인가됨에 따라 계속 리셋트 상태를 유지하게 되므로 초기 전원전압의 인가에 따른 마이크로프로세서의 오동작을 방지할 수 있게 된다.On the other hand, when the power switch is frequently turned on and off, a low potential is applied to the reset terminal of the microprocessor MP until the voltage supplied to the lambda diode D reaches the pinch-off point. Since the reset state is maintained continuously, it is possible to prevent the microprocessor from malfunctioning due to the application of the initial power supply voltage.
상기와 같이 본 고안은 마이크로프로세서에 공급되는 초기 전원전압이나 마이크로프로세서의 전원스우치를 빈번히 온, 오프시키는 경우에 의한 전원전압의 변동으로 인해 발생하는 오동작을 방지하도록 하기위해 마이크로프로세서에 공급되는 전원전압이 안정된 상태로 될때까지 충분한 리셋팅시간을 부여하여 정확학 동작을 할 수 있도록 하는 효과가 있다.As described above, the present invention provides a power supply to the microprocessor to prevent a malfunction caused by fluctuations in the power supply voltage caused by the initial power supply voltage supplied to the microprocessor or the power switch of the microprocessor frequently turned on and off. It has the effect of giving accurate reset time by giving enough reset time until the voltage becomes stable.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850015593U KR890000411Y1 (en) | 1985-11-26 | 1985-11-26 | Reset circuit of micro processor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019850015593U KR890000411Y1 (en) | 1985-11-26 | 1985-11-26 | Reset circuit of micro processor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR870008815U KR870008815U (en) | 1987-06-13 |
| KR890000411Y1 true KR890000411Y1 (en) | 1989-03-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019850015593U KR890000411Y1 (en) | 1985-11-26 | 1985-11-26 | Reset circuit of micro processor |
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| Country | Link |
|---|---|
| KR (1) | KR890000411Y1 (en) |
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1985
- 1985-11-26 KR KR2019850015593U patent/KR890000411Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR870008815U (en) | 1987-06-13 |
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