Fujitsu MB90390 Series Hardware Manual page 479

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External shift clock mode with instruction shift (LSB first)
Figure 22.4-5 Shift Operation Start/Stop Timing (External Shift Clock Mode with Instruction Shift)
SCK4
STRT
BUSY
SOT4
* For an instruction shift, "H" is output when "1" is written to the bit corresponding to SCK of PDR,
and "L" is output when "0" is written. (When SCOE=0 in external shift clock mode)
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Stop by STOP=1 (LSB first, internal clock)
Figure 22.4-6 Stop Timing when "1" is Written to the STOP Bit
SCK4
STRT
BUSY
STOP
SOT4
Note:
DO7 to DO0 indicate output data.
During serial data transfer, data is output from the serial output pin (SOT4) at the falling edge of the shift
clock, and input from the serial input pin (SIN4) at the rising edge.
SCK=0 in PDR
If MODE=0
DO6
(Transfer start)
If MODE=0
DO3
SCK=1 in PDR (Transfer end)
(Transfer stop)
DO4 DO5 (Data maintained)
CHAPTER 22 SERIAL I/O
SCK=0 in PDR
DO7 (Data maintained)
"1" output
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