CHAPTER 16 ASYNCHRONOUS SERIAL INTERFACE/3-WIRE SERIAL I/O
User’s Manual U12697EJ3V0UM
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16.3.3 Standby mode operation
(1) HALT mode operation
Serial transfer operation is normally performed.
(2) STOP mode or IDLE mode operation
(a) When internal clock is selected as serial clock
Asynchronous serial interface mode register n (ASIMn), transmit shift register n (TXSn), receive shift register
n (RXn), and receive buffer register n (RXBn) stop operation holding the value immediately before the clock
stops.
If the clock stops (STOP mode) during transmission, the TxDn pin output data immediately before the clock
stopped is held. If the clock stops during reception, receive data up to immediately before the clock stopped
is stored, and subsequent operation is stopped. When the clock is restarted, reception is resumed.
Remark
n = 1, 2
(b) When external clock is selected as serial clock
Serial transmission is performed normally. However, interrupt requests are held pending without being
acknowledged. Interrupt requests are acknowledged after the STOP mode or IDLE mode has been released
through NMI input, INTP0 to INTP5 input, and INTWT.
Содержание mPD784225 Series
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