NEC 78K0S/KA1+ Preliminary User's Manual page 234

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(a) Release by unmasked interrupt request
When an unmasked interrupt request is generated, the STOP mode is released. After the oscillation
stabilization time has elapsed, if interrupt acknowledgment is enabled, vectored interrupt servicing is
carried out. If interrupt acknowledgment is disabled, the next address instruction is executed.
Standby release
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System clock
Standby release
Remarks 1. The broken lines indicate the case when the interrupt request that has released the standby
234
CHAPTER 13 STANDBY FUNCTION
Figure 13-5. STOP Mode Release by Interrupt Request Generation
(1) If CPU clock is high-speed Ring-OSC clock or external input clock
STOP
instruction
signal
Operation
mode
CPU status
Oscillation
oscillation
(2) If CPU clock is crystal/ceramic oscillation clock
STOP
instruction
signal
Operation
CPU status
mode
Oscillation
System clock
mode is acknowledged.
2. f : Low-speed Ring-OSC clock oscillation frequency
RL
Preliminary User's Manual U16898EJ1V0UD
Interrupt
request
Operation
STOP mode
stops.
(8/f )
RL
Oscillation stops.
Interrupt
request
Operation
Waiting for stabilization
STOP mode
stops.
(HALT mode status)
(8/f )
RL
Oscillation stops.
Oscillation stabilization time
Operation mode
Oscillation
Operation
of oscillation mode
Oscillation
(set by OSTS)