NEC 78K0/KD1 Series User Manual page 352

(2) STOP mode release
The STOP mode can be released by the following two sources.
(a) Release by unmasked interrupt request
When an unmasked interrupt request is generated, the STOP mode is released.
stabilization time has elapsed, if interrupt acknowledgement is enabled, vectored interrupt servicing is carried
out. If interrupt acknowledgement is disabled, the next address instruction is executed.
Figure 18-6. STOP Mode Release by Interrupt Request Generation
Standby release signal
CPU clock
X1 input clock
Standby release signal
CPU clock
Ring-OSC clock
Remark The broken lines indicate the case when the interrupt request that has released the standby mode
is acknowledged.
352
CHAPTER 18 STANDBY FUNCTION
(1) When X1 input clock is used as CPU clock
STOP
instruction
Operating mode
STOP mode
(X1 input clock)
Oscillation stopped
Oscillates
(2) When Ring-OSC clock is used as CPU clock
STOP
instruction
Operating mode
STOP mode
(Ring-OSC clock)
Preliminary User's Manual U16315EJ1V0UD
Wait
(set by OSTS)
Oscillation stabilization
wait status
Oscillates
Oscillation stabilization time (set by OSTS)
Operation
Operating mode
stopped
(Ring-OSC clock)
(17/f )
R
Oscillates
After the oscillation
Operating mode
(X1 input clock)