Handshake method of master central processing unit and slave central processing unit

Abstract

Abstract PURPOSE:To decide a start time point for receiving an instruction, by outputting a power-on signal of a main electric power supply part and a power-on reset signal to a master CPU, from a port of a slave CPU, when the slave CPU has detected a power-on factor of the main electric power supply part. CONSTITUTION:At the time of standby, only a standby electric power supply side shown on the left in the figure is operated, and a slave CPU 1 always monitors a factor of turn-on of a main electric power supply. When the factor of turn-on is detected, the CPU 1 outputs a turn-on signal POWER ON of the main electric power supply through its output port 4, and simultaneously outputs a POWER ON reset signal to a master CPU 3. This reset signal is reset and released, and when the turn-on factor of the main electric power supply is inquired to the CPU, the CPU 1 generates its factor by data SDATA 0-7, outputs a write signal WR to a hand shaking circuit 2, and returns it to the CPU 3.

Inventors

• 👤 Kazumasa Kumakura

Bibliographic Details