Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  18   STANDBY  FUNCTION 

18.3.3  SNOOZE mode 
 

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 

 

 

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Jul 04, 2013