NEC 78K0 Series User Manual page 514

(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 21-3. HALT Mode Release by Interrupt Request Generation
release signal
Status of CPU
High-speed system clock,
internal high-speed oscillation 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
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CHAPTER 21 STANDBY FUNCTION
HALT
instruction
Standby
Operating mode
Preliminary User's Manual U17260EJ3V1UD
Interrupt
request
Wait
HALT mode Wait
Oscillation
8 or 9 clocks
Operating mode