CHAPTER 11 STANDBY FUNCTION
User’s Manual U18172EJ2V0UD
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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
acknowledgement is enabled, vectored interrupt servicing is carried out. If interrupt acknowledgement is
disabled, the next address instruction is executed.
Figure 11-2. HALT Mode Release by Interrupt Request Generation
HALT
instruction
Wait
Wait
Operating mode
HALT mode
Operating mode
Oscillation
System clock
oscillation
Status of CPU
Standby
release signal
Interrupt
request
Remarks 1.
The broken lines indicate the case when the interrupt request which has released the
standby mode is acknowledged.
2.
The wait time is as follows:
• When vectored interrupt servicing is carried out: 11 to 13 clocks
• When vectored interrupt servicing is not carried out: 3 to 5 clocks