UPD78F0411GA-GAM-AX Datasheet, PDF (469/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 19 STANDBY FUNCTION
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 acknowledgment is enabled, vectored interrupt servicing is carried
out. If interrupt acknowledgment is disabled, the next address instruction is executed.
Figure 19-6. STOP Mode Release by Interrupt Request Generation (1/2)
(1) When high-speed system clock (X1 oscillation) is used as CPU clock
STOP
instruction
Interrupt
request
Wait
(set by OSTS)
Standby release signal
Normal operation
(high-speed
Status of CPU system clock)
STOP mode
Normal operation
Oscillation stabilization wait _(high-speed
(HALT mode status)
system clock)
High-speed
system clock
(X1 oscillation)
Oscillates
Oscillation stopped
Oscillates
Oscillation stabilization time (set by OSTS)
(2) When high-speed system clock (external clock input) is used as CPU clock
STOP
instruction
Interrupt
request
Standby release signal
Status of CPU
Normal operation
(high-speed
system clock)
High-speed
system clock
(external clock input)
Oscillates
STOP mode
Oscillation stopped
Wait^Note
Normal operation
(high-speed
system clock)
Oscillates
Note
The wait time is as follows:
• When vectored interrupt servicing is carried out:
• When vectored interrupt servicing is not carried out:
8 or 9 clocks
2 or 3 clocks
Remark The broken lines indicate the case when the interrupt request that has released the standby mode
is acknowledged.
User’s Manual U18698EJ1V0UD
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