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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 19-3. HALT Mode Release by Interrupt Request Generation
Standby
release signal
Status of CPU
High-speed system clock,
Ring-OSC clock,
or subsystem clock
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:
• When vectored interrupt servicing is not carried out: 2 or 3 clocks
382
CHAPTER 19 STANDBY FUNCTION
Interrupt
HALT
instruction
Operating mode
HALT mode
User's Manual U16899EJ2V0UD
request
Wait
Wait
Oscillation
8 or 9 clocks
Operating mode
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