PURPOSE: To reset a CPU at a sender of a serial signal by allowing the CPU to be reset automatically when the level of the serial signal is low for a prescribed time or over.
CONSTITUTION: The serial signal is inputted to an input terminal 3 of the CPU 1 receiving data and an output of a Baud rate generator 2 is inputted to an input terminal 5 of the CPU. The serial signal is inputted to a clear terminal 8 of a counter 7 and a clock pulse from the generator 2 is inputted to a clock terminal 9 of a counter 7. The counter 7 is cleared when the serial signal is inputted and generates no output pulse, but when the serial signal is interrupted for a prescribed time or over, the counter 7 generates an output pulse. The output pulse is inputted to a reset terminal 4 of the CPU1 to reset the CPU1.
FUJITA NORIO
NAKAMICHI HITOSHI
MATSUSHITA SEIKO KK