NEC uPD78P078 - Manual (Page 551)

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CHAPTER 24 STANDBY FUNCTION
STOP
Instruction
Wait
(Time set by OSTS)
Oscillation Stabilization
Wait Status
Operating
Mode
Oscillation
Operationg
Mode
STOP Mode
Oscillation Stop Oscillation
Standby
Release Signal
Clock
Interrupt Request
(2) STOP mode release
The STOP mode can be released with the following three types of sources.
(a) Release by unmasked interrupt request
An unmasked interrupt request is used to release the STOP mode. If interrupt request acknowledge
is enabled after the lapse of oscillation stabilization time, vectored interrupt service is carried out. If
interrupt request acknowledge is disabled, the next address instruction is executed.
Figure 24-4. STOP Mode Released by Interrupt Request Generation
Remark The broken line indicates the case when the interrupt request which has cleared the standby status
is acknowledged.
(b) Release by unmasked test input
The STOP mode is released by inputting an unmasked test signal. After the lapse of oscillation
stabilization time, the instruction at the next address of the STOP instruction is executed.