UPD78F1502AGK-GAK-AX Datasheet, PDF (801/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 21 STANDBY FUNCTION
(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 21-6. 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
High-speed
system clock
(external clock input)
Normal operation
(high-speed
system clock)
Oscillates
STOP mode
Supply of the CPU
clock is stopped
(about 23.3
Wait
to 30.7 μs) ^{(2 clocks)}
Normal operation
(high-speed
system clock)
Oscillation stopped
Oscillates
Remark The broken lines indicate the case when the interrupt request that has released the standby mode is
acknowledged.
R01UH0004EJ0501 Rev.5.01
785
Jun 20, 2011