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CHAPTER 14 8-BIT SERIAL I/O
14.8 8-Bit Serial I/O Operation in Each Mode
This section describes the operation of the 8-bit serial I/O if the 8-bit serial I/O switches
to sleep or stop mode or a stop request is issued when it is in operation.
■ When the Internal Shift Clock is Used
● 8-bit serial I/O operation in sleep mode
In sleep mode, as shown in Figure 14.8-1 , the 8-bit serial I/O continues data transfer without stopping the
serial I/O operation.
Figure 14.8-1 8-bit Serial I/O Operation in Sleep Mode (Internal Shift Clock)
● 8-bit serial I/O operation in stop mode
In stop mode, as shown in Figure 14.8-2 , the 8-bit serial I/O stops the serial I/O operation and suspends
data transfer. After stop mode has been released, reinitialize the 8-bit serial I/O because operation is
resumed halfway.
#0 #1 #2 #4#3 #5 #6 #7
SCK output
SST bit
SIOF bit
Clear via program
Interrupt request
SO pin output
SLP bit
(STBC register)
Sleep mode
Sleep mode release via IRQC