Datasheet

RL78/L12 CHAPTER 19 STANDBY FUNCTION
R01UH0330EJ0200 Rev.2.00 743
Dec 13, 2013
19.3.3 SNOOZE mode
(1) SNOOZE mode setting and operating statuses
The SNOOZE mode can only be specified for CSI00, UART0, 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 CSI00 or UART0 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.
In SNOOZE mode transition, wait status to be only following time.
Transition time from STOP mode to SNOOZE mode: 18
μ s to 65 μ s
Remark Transition time from STOP mode to SNOOZE mode varies depending on the temperature conditions and the
STOP mode period.
From SNOOZE 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.
<R>
<R>
<R>