Patent ID: 6924901

Claim:
A communication system comprising: a main controller that controls the communication system; a communication controller that controls a serial communication; a plurality of sub-communication units that perform the serial communication with said communication controller; a first resetting unit that is implemented by a circuit separate from said main controller and said communication controller and sets said main controller into a reset state; and a second resetting unit that is implemented by another circuit separate from said main controller and said communication controller and sets said communication controller into a reset state; wherein: said second resetting unit sets said communication controller into the reset state after said first resetting unit sets said main controller into the reset state when a power supply of the communication system is turned off; said communication controller transmits reset data as predetermined serial data to said plurality of sub-communication units to thereby reset said plurality of sub-communication units if said first resetting unit sets said main controller into the reset state when the power supply of the communication system is turned off; and said second resetting unit sets said communication controller into the reset state after said communication controller transmits the reset data to said plurality of sub-communication units.