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RL78/G1P
CHAPTER 16 STANDBY FUNCTION
R01UH0895EJ0100 Rev.1.00
605
Nov 29, 2019
16.3.3 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 serial standby control register m (SSCm) to
1 immediately before switching to the STOP mode. For details, see
11.3 Registers Controlling Serial Array Unit
.
When using the A/D converter in the SNOOZE mode, set the AWC bit of A/D converter mode register 2 (ADM2) to 1
immediately before switching to the STOP mode. For details, see
9.3 Registers Controlling A/D Converter
.
Remark
p = 00; q = 0; m = 0
In SNOOZE mode transition, wait status to be only following time.
Transition time from STOP mode to SNOOZE mode: 18
s to 65
s
Remark
Transition time from STOP mode to SNOOZE mode varies depending on the temperature conditions and
the STOP mode period.
Transition time from SNOOZE to normal operation:
When vectored interrupt servicing is carried out:
HS (High-speed main) mode: “4.99
s to 9.44
s” + 7 clocks
LS (Low-speed main) mode: “1.10
s to 5.08
s” + 7 clocks
When vectored interrupt servicing is not carried out:
HS (High-speed main) mode: “4.99
s to 9.44
s” + 1 clock
LS (Low-speed main) mode: “1.10
s to 5.08
s” + 1 clock
The operating statuses in the SNOOZE mode are shown below.