States In Each Mode During 8-Bit Serial I/O Operation; Figure 8.8-1 Operation In Sleep Mode (Internal Shift Clock); Figure 8.8-2 Operation In Stop Or Watch Mode (Internal Shift Clock) - Fujitsu F2MC-8L Series Hardware Manual

8.8

States in Each Mode during 8-bit Serial I/O Operation

This section describes the operation of the 8-bit serial I/O when the device changes to
sleep mode, or to stop or watch mode, or when the operation halts, during the serial
I/O operation.
Using Internal Shift Clock
Operation in sleep mode
In sleep mode, serial I/O operation does not halt but transfer continues, as shown in Figure 8.8-
1.
SCK output
SST bit
SIOF bit
SO pin output
SLP bit
(STBC register)
Operation in stop or watch mode
In stop or watch mode, serial I/O operation halts and transfer aborts, as shown in Figure 8.8-2.
As operation restarts from the point where it halted after wake-up from stop or watch mode,
initialize the 8-bit serial I/O again depending on the state of the device with which the 8-bit serial
I/O is communicating.

Figure 8.8-2 Operation in Stop or Watch Mode (Internal Shift Clock)

SCK output
SST bit
SIOF bit
SO pin output
STP bit
(STBC register)

Figure 8.8-1 Operation in Sleep Mode (Internal Shift Clock)

#0 #1 #2
#0 #1 #2
8.8 States in Each Mode during 8-bit Serial I/O Operation
#3 #4 #5 #6 #7
Sleep mode
Wake-up from sleep mode by IRQ4
Oscillation stabili-
Stop or watch
zation delay time
mode request
#3 #4 #5
Stop or watch
mode
Wake-up from stop or watch mode by an external interrupt
Cleared by the program.
Interrupt request
Cleared by the program.
Interrupt request
#6 #7
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