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RL78/G1A CHAPTER 18 STANDBY FUNCTION
18.3.3 SNOOZE mode
(1) SNOOZE mode setting and operating statuses
The SNOOZE mode can only be specified for CSIp, UARTq, or the A/D converter. Note that this mode can only be
specified if the CPU clock is the high-speed on-chip oscillator clock.
When using CSIp or UARTq in the SNOOZE mode, set the SWCm bit of the serial standby control register m (SSCm)
to 1 immediately before switching to the STOP mode. For details, see 12.3 Registers Controlling Serial Array Unit.
When using the A/D converter in the SNOOZE mode, set the AWC bit of the A/D converter mode register 2 (ADM2) to
1 immediately before switching to the STOP mode. For details, see 11.3 Registers Used in A/D Converter.
Remark p = 00; q = 0; m = 0
The following time is required for mode transition.
Transition time from STOP mode to SNOOZE mode: 18 to 65
μ
s
Remark The time required to transition from STOP mode to SNOOZE mode depends on the temperature conditions
and the STOP mode period.
Transition time from SNOOZE mode to normal operation:
• When vectored interrupt servicing is carried out:
HS (High-speed main) mode: 4.99 to 9.44
μ
s + 7 clocks
LS (Low-speed main) mode: 1.10 to 5.08
μ
s + 7 clocks
LV (Low-voltage main) mode: 16.58 to 25.40
μ
s + 7 clocks
• When vectored interrupt servicing is not carried out:
HS (High-speed main) mode: 4.99 to 9.44
μ
s + 1 clock
LS (Low-speed main) mode: 1.10 to 5.08
μ
s + 1 clock
LV (Low-voltage main) mode: 16.58 to 25.40
μ
s + 1 clock
The operating statuses in the SNOOZE mode are shown below.
R01UH0305EJ0200 Rev.2.00 737
Jul 04, 2013