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CHAPTER 14 8-BIT SERIAL I/O
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When the External Shift Clock is Used
● 8-bit serial I/O operation in sleep mode
In sleep mode, as shown in Figure 14.8-4 , the 8-bit serial I/O continues data transfer without stopping the
serial I/O operation.
Figure 14.8-4 8-bit Serial I/O Operation in Sleep Mode (External Shift Clock)
● 8-bit serial I/O operation in stop mode
In stop mode, as shown in Figure 14.8-5 , the 8-bit serial I/O stops the serial I/O operation and suspends
data transfer. After stop mode has been released, a transfer destination error occurs because operation is
resumed halfway. In this case, initialize the 8-bit serial I/O.
Figure 14.8-5 8-bit Serial I/O Operation in Stop Mode (External Shift Clock)
#0 #1 #2 #4#3
#7
#5
#6
SCK input
SST bit
SIOF bit
Clock for the next data
Transfer stop state
Clear via program
Interrupt request
SO pin output
STP bit
(STBC register)
Sleep mode
Sleep mode release via IRQC
#0 #1 #2 #4#3 #5 #6 #7
#6 #7
SCK input
SST bit
Oscillation stabilization
wait time
Clock for the next data
Stop mode request
Clear via
program
Interrupt
request
SIOF bit
SO pin output
STP bit
(STBC register)
Stop mode
Transfer error occurrence
Stop mode release via external interrupt