CHAPTER 14 STANDBY FUNCTION
Preliminary User’s Manual U19014EJ1V0UD
414
(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 14-3. HALT Mode Release by Interrupt Request Generation
HALT
instruction
Wait
Wait
Operating mode
HALT mode
Operating mode
Oscillation
High-speed system clock or
internal high-speed oscillation clock
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:
8 or 9 clocks
• When vectored interrupt servicing is not carried out: 2 or 3 clocks
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