Figure 10.6C 8-Bit Serial Output Operation - Fujitsu F2MC-8L MB89620 Series Hardware Manual

Figure 10.6c shows the 8-bit serial output operation.
For LSB first
SDR
n Operation at Completion of Serial Output
The 8-bit serial I/O sets the interrupt request flag bit (SMR: SIOF = "1") and clears the serial I/O
transfer start bit (SMR: SST = "0") on the rising edge of the shift clock after the serial data of the
eighth bit is input or output.
MB89620 series
Bit 7 Bit 6 Bit 5
#7 #6 #5
Serial
#0
output data
Shift clock
0 1
SIOF bit
Transfer start
SST bit

Figure 10.6c 8-bit Serial Output Operation

CHAPTER 10 8-BIT SERIAL I/O (SERIAL I/O-1 AND SERIAL I/O-2)
Bit 4 Bit 3 Bit 2 Bit 1
#4 #3 #2
#1 #2 #3 #4
2 3 4
Automatically cleared when transfer completes.
Bit 0
SO pin
#1 #0
#5 #6 #7
Cleared
5 6 7 by program.
Interrupt request
10
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