SU1474653A1 - Microprocessor activation and restart-under power-down facility - Google Patents

Abstract

The invention relates to the field of measuring and computing technology and can be used to turn on and restart a microprocessor in the event of a power failure. The aim of the invention is to reduce hardware costs and expand the class of tasks of the device by providing two modes of operation. The goal is achieved by the fact that in a device containing a pulse generator 5, trigger 6, switching element 4, charging capacitor 2 and parallel-connected discharge diode 1 and charging resistor 3, the connections between the elements are changed. Depending on the position of element 4, the device issues either a single microprocessor reset pulse or a series of pulses until a setup confirmation pulse is received from the microprocessor. 3 il.

Description

Ј

O5 recounted

with

Phie.1

eleven

The invention relates to computing and measurement technology and can be used to turn on and restart a microprocessor in case of power failure,

The aim of the invention is to reduce hardware costs and expand the class of tasks of the device.

Fig. 1 shows the functional diagram of the device, Fig. 2 and 3 shows the time diagrams of the device operation.

The device (Fig. 1) contains a discharge diode 1, a charging capacitor 2, a charging resistor 3 "switching element 4, a generator of 5 pulses, a trigger 6E element AND NOT 7, an input 8 confirming the installation of the initial state of the microprocessor and output 9 reset the microprocessor device with t yes,

The device works as follows.

When the device operates in single reset mode (FIG. 2), the switching element 4 is set to position I. Suppose, for example, at time t1 the power is connected to the circuit and the charging capacitor 2 is charged by charging through the opening 3. In this case, the trigger 6 is installed on the installation input in the unit.

When the charge capacitor 2 of the voltage level reaches the charge level, equal to the level of the logical unit (plot a) s supplied to the control input of the generator 5 pulses, the latter begins to produce a series of pulses (plot b) and the pulse duration must be greater than the required duration of the microprocessor reset signal.

The first pulse is inverted and transmitted by element K-HE 7 to output 9 of the device microprocessor reset (plot i). At the end of the effect of the reset pulse to the output of the element NE-NE 7 (plot ю) by the signal drop from zero to one, received from this output at the clock input; The trigger records information from its information entry, p. the output of the switching element 4 (in the example shown, the logical ring, plot 5, ts), the logical zero signal from the output of the trigger b locks the AND-NE element 7 and the pulses from the output of the generator 5 to the output 9

five

46

five

-

0

4 0

3 0 5

532

microprocessor reset device does not arrive. In the event of a power failure, the charge capacitor 2 is discharged through the discharge cyode 1 into the power supply circuit, and when the lithium is restored, the operation cycle of the device is repeated.

When the device is in standby mode (Fig. 3), the switching element 4 is set to position II.

 Work in this mode until time point c3 is similar to that described at the time point ie (plot ю} information at the output of flip-flop 6 does not change, since Hi1 of its information input contains a logical unit signal, if up to time point t nz confirmation 8 setting the microprocessor to its initial state does not give a zero level signal; the circuit produces a repeated reset pulse.

When the microprocessor is reset, the latter issues a zero-level signal to the input 8 of the microprocessor’s initial state (plot Q, tj), which enters the reset input of the trigger 6 and sets the output of the logical zero signal at its output, I-FE 7, and blocking his work. The reset cycle of the microprocessor to the initial state is over.

Claims (1)

Invention Formula A device for switching on and restarting a microprocessor in case of power failure, containing a pulse generator, a trigger, an information input connected to the output of the switching element, the first input of which is connected via a charging capacitor to a zero potential bus, a discharge diode connected in parallel with a charging resistor, and a NAND element, the anode of the discharge diode being connected to the first input of the switching element, the cathode of the diode being the input of the device for connecting to the output of a monitored power source, Thus, for the purpose of comparing equipment devices, the 5th input of the trigger installation is connected to the anode of the discharge cyor and to the input of the pulse generator, the output of which and the output of the RA are connected respectively to the first by the fruits of Lemeyr I-IE, vmkhoa 314746534 which is connected to the sync connection to the confirmation output trigger and is the output of the device in the initial state of the mix for connecting to the reset input of the processor, the second input by the switches of the microprocessor, the reset input of the trigger-. element is connected to the fault Pa is the device input for zero potential. J but Bh C 1-I-I Que.Z