NEC 78K0S/KB1+ User Manual page 239

(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 14-2. HALT Mode Release by Interrupt Request Generation
Standby
release signal
Operating mode
Status of CPU
System clock
oscillation
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
CHAPTER 14 STANDBY FUNCTION
Interrupt
request
HALT
instruction
HALT mode
Oscillation
User's Manual U17446EJ3V1UD
Wait
Wait Operating mode
239