| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise superposed on a signal on a bus during a period a master communication device is transmitting a synchronization signal.SOLUTION: A slave communication device 3 includes: a synchronization circuit 12b that identifies a period a master communication device is transmitting a synchronization signal; a timing generation circuit 12e that switches on-and-off of an enable signal in response to the input of synchronization timing from the synchronization circuit 12b; and a resistance increase circuit 18 that increases a resistance value in response to switching from off to on of the enable signal. The enable signal is switched from off to on during a period the master communication device 2 is transmitting a synchronization signal, thereby current from a power supply voltage is made hard to flow through a bus connection line 15, and thus current flowing from the slave communication device 3 to a bus 4 is restrained. |
