Renesas rl78 User Manual
RL78/G1A
CHAPTER 18 STANDBY FUNCTION
(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 acknowledgment is enabled, vectored interrupt servicing is carried out. If interrupt
acknowledgment is disabled, the next address instruction is executed.
Figure 18-3. STOP Mode Release by Interrupt Request Generation (1/2)
(1) When high-speed on-chip oscillator clock is used as CPU clock
<R>
Standby release signal
Note 1
Status of CPU
High-speed on-chip
oscillator clock
Normal operation
(high-speed on-chip
oscillator clock)
Oscillates
STOP mode
Oscillation stopped
Wait for oscillation
accuracy stabilization
Interrupt
request
STOP
instruction
Normal operation
(high-speed on-chip
oscillator clock)
Oscillates
Wait
Supply of the
clock is stopped
STOP mode release time
Note 2
Notes 1. For details of the standby release signal, see Figure 16-1.
2.
STOP mode release time
Supply of the clock is stopped: 18
μ
s to 65
μ
s
Wait
• When vectored interrupt servicing is carried out:
• When vectored interrupt servicing is carried out:
7 clocks
• When vectored interrupt servicing is not carried out: 1 clock
Remarks 1. The clock supply stop time varies depending on the temperature conditions and STOP mode
period.
2. The broken lines indicate the case when the interrupt request that has released the standby mode
is acknowledged.
R01UH0305EJ0200 Rev.2.00
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Jul 04, 2013