Figure 8.6-3 8-Bit Serial Output Operation - Fujitsu F2MC-8L Series Hardware Manual

CHAPTER 8 8-BIT SERIAL I/O
Figure 8.6-3 shows the 8-bit serial output operation.
For LSB first
SDR
Serial
output data
Shift clock
SIOF bit
SST bit
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.
206

Figure 8.6-3 8-bit Serial Output Operation

Bit 7 Bit 6 Bit 5 Bit 4
#7 #6 #5 #4
#0 #1
0 1
Transfer start
Bit 3 Bit 2 Bit 1
#3 #2 #1
#2 #3 #4
2 3 4 5
Automatically cleared when transfer completes.
Bit 0
SO pin
#0
#5 #6 #7
Cleared
6 7 by program.
Interrupt request