Stop Mode Release By Interrupt Request Generation - NEC mPD780208 Subseries User Manual

(2) STOP mode release
The STOP mode can be released by the following three sources.
(a) Release by unmasked interrupt request
When an unmasked interrupt request is generated, the STOP mode is released. If interrupt request
acknowledgment is enabled after the lapse of oscillation stabilization time, vectored interrupt
servicing is carried out. If interrupt request acknowledgment is disabled, the instruction at the next
address is executed.
Figure 17-4. STOP Mode Release by Interrupt Request Generation
Standby
release signal
Operating
mode
Oscillation
Clock
Remark The broken line indicates the case when the interrupt request which has released the standby
status is acknowledged.
(b) Release by unmasked test input
When an unmasked test signal is input, the STOP mode is released. After the lapse of oscillation
stabilization time, the instruction at the next address to the STOP instruction is executed.
CHAPTER 17 STANDBY FUNCTION
Interrupt request
STOP
instruction
STOP mode
Oscillation
stop
User's Manual U11302EJ4V0UM
Wait
(time set by OSTS)
Oscillation stabilization
wait status
Oscillation
Operating
mode
365