Datasheet

CHAPTER 19 STANDBY FUNCTION
User’s Manual U18698EJ1V0UD
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(2) HALT mode release
The HALT mode can be released by the following two sources.
(a) Release by unmasked interrupt request
When an unmasked interrupt request is generated, the HALT mode is released. If interrupt acknowledgment
is enabled, vectored interrupt servicing is carried out. If interrupt acknowledgment is disabled, the next
address instruction is executed.
Figure 19-3. HALT Mode Release by Interrupt Request Generation
HALT
instruction
Wait
Note
Normal operationHALT mode Normal operation
Oscillation
High-speed system clock,
internal high-speed oscillation clock,
or subsystem clock
Status of CPU
Standby
release signal
Interrupt
request
Note The wait time is as follows:
• When vectored interrupt servicing is carried out: 8 or 9 clocks
• When vectored interrupt servicing is not carried out: 2 or 3 clocks
Remark The broken lines indicate the case when the interrupt request which has released the standby
mode is acknowledged.