Fujitsu F2MC-16LX Hardware Manual page 159

Note:
When executing an interrupt, an instruction next to the instruction specifying the watch mode
is normally executed first before an interrupt request is processed. If a change to the watch
mode occurs at the same time as an external bus hold request is received, an interrupt may
be executed first before the next instruction is executed.
Figure 6.5-2 "Cancel operation of watch mode (external reset)" illustrates the cancel operation
of the watch mode.
Figure 6.5-2 Cancel operation of watch mode (external reset)
RST pin
Watch mode
Main clock
Not operating
PLL clock
Sub clock
CPU clock
CPU operation
CHAPTER 6 LOW-POWER CONSUMPTION MODE
During oscillation
Oscillation stabilization wait
Not operating
Oscillating
Not operating
Main clock
Not operating
Sequence for resetting
Reset cancel
Watch mode cancel
Processing
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