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CHAPTER 11 SERIAL INTERFACE FUNCTION
User’s Manual U15109EJ3V0UD
453
11.6.4 Standby function
(1) Operation in HALT mode
Serial transfer is performed normally.
(2) Operation in STOP and IDLE modes
(a) When internal clock is selected as serial clock
The operations of asynchronous serial interface mode register n (ASIMn), transmit shift register n (TXSn),
and receive buffer register n (RXBn) are stopped and their values immediately before the clock stopped are
held.
The TXDn pin output holds the data immediately before the clock is stopped (in STOP mode) during
transmission. When the clock is stopped during reception, the receive data until the clock stopped is stored
and subsequent receive operations are stopped. Reception resumes upon clock restart.
(b) When external clock is selected as serial clock
Serial transfer is performed normally.