Electronics America 8-Bit Single-Chip Microcontrollers User's Manual

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CHAPTER 18 SERIAL INTERFACE CHANNEL 1
Figure 18-21. Operation Timings when Using Busy & Strobe Control Option (BUSY0 = 0)
Caution When TRF is cleared, the SO1 pin becomes low level.
Remarks CSIIF1: Interrupt request flag
TRF : Bit 3 of the auto data send and receive control register (ADTC)
SCK1
SO1 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
STB
BUSY
SI1 D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0
TRF
Busy Input Valid
Busy Input Clear
CSIIF1