When The External Shift Clock Is Used - Fujitsu F2MC-8L F202RA Hardware Manual

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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)
SCK input
SST bit
SIOF bit
SO pin output
STP bit
(STBC register)
● 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)
SCK input
SST bit
SIOF bit
SO pin output
STP bit
(STBC register)
#0 #1 #2
#0 #1 #2 #3
#3 #4
#5 #6
Sleep mode
Sleep mode release via IRQC
#6 #7
Stop mode request
#4 #5
Stop mode
Stop mode release via external interrupt
CHAPTER 14 8-BIT SERIAL I/O
Clock for the next data
Transfer stop state
Clear via program
Interrupt request
#7
Clock for the next data
Oscillation stabilization
wait time
Clear via
program
#6 #7
Transfer error occurrence
Interrupt
request
331