CHAPTER 11 STANDBY FUNCTION
User’s Manual U18172EJ2V0UD
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11.2 Standby Function Operation
11.2.1 HALT mode
(1) HALT
mode
The HALT mode is set by executing the HALT instruction.
The operating statuses in the HALT mode are shown below.
Caution Because an interrupt request signal is used to clear the standby mode, if there is an interrupt
source with the interrupt request flag set and the interrupt mask flag clear, the standby mode
is immediately cleared if set.
Table 11-2. Operating Statuses in HALT Mode
Low-Speed Internal Oscillator can be stopped
Note
.
Setting of HALT Mode
Item
Low-Speed Internal
Oscillator cannot be
stopped
Note
.
When Low-Speed Internal
Oscillation Continues
When Low-Speed Internal
Oscillation Stops
System clock
Clock supply to CPU is stopped.
CPU Operation
stops.
Port (latch)
Holds status before HALT mode was set.
16-bit timer/event counter 00
Operable
Sets count clock to f
XP
to f