UPD78F9500MA-CAC-A Datasheet, PDF (196/342 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcontrollers

CHAPTER 11 STANDBY FUNCTION
(a) Release by unmasked interrupt request
When an unmasked interrupt request (8-bit timer H1^Note, low-voltage detector, external 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.
Note Only when sets count clock to fRL/2⁷
<R>
Figure 11-5. STOP Mode Release by Interrupt Request Generation
(1) If CPU clock is high-speed internal oscillation clock or external input clock
Standby release
signal
CPU status
STOP
instruction
Interrupt
request
Operation
mode
STOP mode
Operation
stops^Note.
System clock
oscillation
Oscillation
Oscillation stops.
Operation mode
Oscillation
(2) If CPU clock is crystal/ceramic oscillation clock (μPD78F920x only)
Standby release
signal
STOP
instruction
Interrupt
request
Operation
CPU status _mode
System clock ^Oscillation
STOP mode
Operation Waiting for stabilization Operation
stops^Note.
of oscillation
mode
(HALT mode status)
Oscillation stops.
Oscillation
Oscillation stabilization time
(set by OSTS)
Note The operation stop time is 17 μs (MIN.), 34 μs (TYP.), and 67 μs (MAX.).
Remark The broken lines indicate the case when the interrupt request that has released the standby mode
is acknowledged.
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User’s Manual U18172EJ3V0UD