SU1151972A1 - Device for switching on and restarting microprocessor after occurence of power supply fault - Google Patents

Abstract

yCTPOiteTBO FOR INCLUDING AND RESTARTING A MICROPROCESSOR DURING Fault 1, containing a discharge diode, the cathode is the input of a monitored voltage of the device, and the anode is connected to a wide logical zero, trigger, a socket outlet through the first charging capacitor, and the anode through the first charging capacitor is connected to a wider zero, a socket. , the output of which is NOT connected to the output of the device microprocessor reset signal through the element, characterized in that, in order to reduce hardware costs, two limiting resistors and a second charge terminal are introduced into the device a capacitor, the anode of the discharge diode is connected to the setup input of the trigger and through the first limiting resistor To the input of the monitored voltage of the device, the reset input of the trigger is input (the confirmation signal, the installation of the device microprocessor, the second input of the NAND element is connected through the second charging the capacitor with the output of the element is NOT and through the second limiting resistor - with the departure of the element YE.

Description

The invention relates to computing and can be used to collect the state of a controller or other device containing a microprocessor when connecting or powering off. A restart device at power up or power failures is known, comprising a first unit that supplies a controlled voltage, a second unit that supplies a given reference voltage, a first comparison unit, a third unit that supplies a second reference voltage, a delay unit, a second comparison unit and timer. The device periodically monitors the supply voltage and, if a fault is detected, it restarts the device. The disadvantage of this device is large hardware. The closest in technical essence to the present invention is a device for turning on and restarting a microprocessor in case of power failure, containing a trigger, a pulse shaper, two NOT elements, a discharge diode, an AND-NOT element, the first input and output of which are connected respectively to the output. the trigger and the input of the first element NOT, the IL element and the charge capacitor, with the output of the NAND element. connected to the output of the discharge diode and through a charge capacitor to the bus of logical zero, the cathode of the discharge diode is the input of a controlled supply voltage of the device, the output of the element is NOT connected to the output output of the device microprocessor and through the second element NOT to the input of the pulse shaper and the installation input of the trigger, a counting input connected to the output of the OR element, the first input of which is the input confirmation of the installation of the microprocessor of the device, and the second input connected to the output of the impulse driver and the second input of the element IS-NOT z The known device sends a reset pulse to the microprocessor system, and then waits for a Response signal from it. If the microprocessor system does not confirm for a predetermined time interval, that it is set to the outgoing state, the device generates a repeated reset pulse. The reset pulses enter the microprocessor system until the latter confirms that it has been reset. The disadvantages of the known device are high hardware costs and low reliability. The purpose of the invention is to reduce hardware costs and increase the reliability of the device. This goal is achieved by the fact that the device containing a discharge diode whose diode is the input of a controlled voltage of the device and the anode is connected via a first charging capacitor to the bus zero, a trigger, and an output connected to the first input element. , the output of which is NOT connected to the code of the device's microprocessor reset signal through an element, two limiting resistors and a second charging capacitor are inserted, the anode of the discharge diode being connected to the setup input TpHrrepa and through the first about restrictors resistor to the input of voltage controlled device, the reset input of the flip-flop is input acknowledgment signal setting device microprocessor, the second input of AND-NO element is connected via a second capacitor with a charging output of NOT circuit and via a second limiting resistor - to the input of NOT. FIG. 1 shows a functional diagram of the proposed device; in fig. 2 is a time chart illustrating the operation of the device. The device (FKG. 1) contains the discharge diode 1, the first limiting resistor 2, the first charging capacitor 3, the input 4 of the microprocessor installation confirmation signal, the trigger 5, the generator b of pulses, the states from the AND-HE element 7, the HE element 8, the second limiting resistor 9 and the charging capacitor 10, the output 11 of the device microprocessor reset signal, the input 12 of the monitored voltage of the device, the trigger 5 is built on the elements AND-HE 13 and 14. The device operates as follows.

3

in the initial state at the input 12 there is no controlled voltage and, at the installation input of the trigger 5 - a logical zero signal (Fig. 2e |), at the input 4 and the output of the trigger 5 - logical unit signals (Fig. 2b and c), at the output 11, microprocessor reset pulses are generated (Fig. 2 (J). The occurrence of a monitored voltage at input 12 does not change the state of the device, and reset pulses continue to arrive from output 11. After the installation confirmation signal is received from input microprocessor 4 (FIG. 2 &) trigger 5 is reset and takes the signal l cal "Work feed 7 from the input element and the output signal 11 is set to a logic-zero until the new trigger 5.

When the monitored voltage source is disconnected and disconnected at input 12, the voltage is removed and

519724

when it reaches the logical zero level, trigger 5 is triggered, the process of issuing reset pulses to the microprocessor continues until, with the restored monitored voltage level at input 12, input signal 4 is set from the microprocessor.

In the case of microprocessor control, the potential for the sigga-output device can be connected directly to one of the outputs of the trigger 5. In this case, a single signal at the direct or zero signal at the inverse of the trigger outputs serves as a signal for the absence of a controlled voltage at the input 12.

Thus, the proposed device provides control of the power supply and blocking of the microprocessor system a I.

2

Claims (1)

DEVICE FOR TURNING ON AND RESETTING THE MICROPROCESSOR DURING POWER FAILURES, containing a discharge diode, the cathode of which is the input of the monitored voltage of the device, and the anode is connected to the logic zero bus via the first charging capacitor, a trigger, a direct output connected to the first input of the AND-NOT element, the output which through the element is NOT connected to the output of the reset signal of the microprocessor of the device, characterized in that, in order to reduce hardware costs, two limiting resistors and a second charge th capacitor, and the anode of the discharge diode connected to the installation input of the trigger and through the first limiting resistor to the input of the monitored voltage of the device, the reset input of the trigger is the input of the confirmation signal, the microprocessor of the device is installed, the second input of the AND element is NOT connected through the second charging capacitor to the output of the element NOT and through the second limiting resistor - with the input of the element ЕЕ. Figure 1