Holtek Microelectronics Inc.

Yi Lin

Jason Chen

Henry Fan

Kuo-Cheng Yu

A voltage detector circuit for instantaneously detecting abnormal voltages in a micro controller includes a voltage detection circuit connected between the power supply and reset voltage ends of an internal circuit of the micro controller so as to instantaneously detect changes in the power supply, without the time delay associated with the external low pass filter that supplies the reset voltage. The detecting circuit is a logic 'NOT' gate which has a power supply connecting end connected to a reset voltage end of the internal circuit, an input end connected to the power supply end of the internal circuit, and an output end connected to a cooperating input end of the latch circuit, so that the latch circuit latches a signal output by the voltage detector whenever an abnormal power supply voltage is detected, and outputs a flag signal to the micro controller to effect an instantaneous reset of the micro controller. The latch may be a flip-flop, in which case one of the flip-flop inputs is connected to the voltage detector output and the other input may be connected together with the flip-flop power supply input to the reset voltage, the flip-flop providing two outputs, one of which may be connected to the micro controller reset pin, and the other of which may be connected to an interrupt or other indicator device.

Means for instantaneously detecting abnormal voltage in a micro

A data shift control circuit for a shift register in response to a logic operation command code is disclosed. The shift register includes a first register and a second register and the logic operation command code includes a first portion and a second portion. The circuit includes a first decoder for decoding the first portion to transmit a move signal; a second decoder for decoding the second portion to transmit a control signal; a control signal channel, electrically connected to the first register and the second register, for allowing the first register and the second register to receive the control signal and for allowing the shift register to execute a first action; and a move signal channel, electrically connected to all registers of the shift register for allowing the all registers to receive the move signal and for allowing the move register to execute a second action.

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Tao Yuan, Taiwan

Yi Lin