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CHAPTER 23 STANDBY FUNCTION
STOP
Instruction
Wait
(Time set by OSTS)
Oscillation Stabilization
Wait Status
Operating
Mode
Oscillation
Operationg
Mode STOP Mode
Oscillation StopOscillation
Standby
Release Signal
Clock
Interrupt
Request
(2) STOP mode release
The STOP mode can be cleared with the following three types of sources.
(a) Release by unmasked interrupt request
When an unmasked interrupt request is generated, the STOP mode is cleared. 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 23-4. STOP Mode Release 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
When an unmasked test signal is input, the STOP mode is cleared. And after the lapse of oscillation
stabilization time, the instruction at the next address of the STOP instruction is executed.