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(d) Automatic transmission/reception suspension and restart
Automatic transmission/reception can be temporarily suspended by setting bit 7 (CSIE10) of the serial
operating mode register 1 (CSIM1) to 0.
If, during 8-bit data transfer, the transmission/reception is not suspended, it is suspended upon completion
of 8-bit data transfer.
When suspended, bit 3 (TRF0) of the automatic data transmit/receive control register (ADTC0) is set to
0 after transfer of the 8th bit, and all the port pins used with the serial interface pins for dual function (P84/
SI1, P83/SO1, P82/SCK1, P81/BUSY, and P80/STB) are set to the port mode.
During restart of transmission/reception, remaining data can be transferred by setting CSIE10 to 1 and
writing any data to the serial I/O shift register 1 (SIO1).
Cautions
1. If the HALT instruction is executed during automatic transmission/reception,
transfer is suspended and the HALT mode is set even if 8-bit data transfer is in
progress.
2. When suspending automatic transmission/reception, do not change the operating
mode to 3-wire serial I/O mode while TRF0 = 1.
Figure 14-16. Automatic Transmission/Reception Suspension and Restart
CSIE10 = 0 (Suspended command)
SCK1
SO1
D7 D6 D5 D4 D3 D2 D1 D0
SI1
D7 D6 D5 D4 D3 D2 D1 D0
CSIE10: Bit 7 of serial operating mode register 1 (CSIM1)
CHAPTER 14 SERIAL INTERFACE (SIO1)
Suspend
Preliminary User's Manual U13420EJ2V0UM00
Restart command
CSIE10 = 1, Write to SIO1
D7 D6 D5 D4 D3 D2 D1 D0
D7 D6 D5 D4 D3 D2 D1 D0
243
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