CHAPTER 18 STANDBY FUNCTION
Preliminary User’s Manual U16315EJ1V0UD
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(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. After the oscillation
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
(1) When X1 input clock is used as CPU clock
Operating mode
Operating mode
Oscillates
Oscillates
STOP
instruction
STOP mode
Wait
(set by OSTS)
Standby release signal
Oscillation stabilization
wait status
Oscillation stopped
X1 input clock
CPU clock
Oscillation stabilization time (set by OSTS)
(X1 input clock)
(X1 input clock)
(2) When Ring-OSC clock is used as CPU clock
Operating mode
Operating mode
Oscillates
STOP
instruction
STOP mode
Standby release signal
Ring-OSC clock
CPU clock
(Ring-OSC clock)
Operation
stopped
(17/f
R
)
(Ring-OSC clock)
Remark
The broken lines indicate the case when the interrupt request that has released the standby mode
is acknowledged.