RL78/G1H CHAPTER 20 STANDBY FUNCTION
R01UH0575EJ0120 Rev. 1.20 Page 732 of 920
Dec 22, 2016
Caution 1. The STOP mode can be used only when the CPU is operating on the main system clock. Do not
set to the STOP mode while the CPU operates with the subsystem clock. The HALT mode can be
used when the CPU is operating on either the main system clock or the subsystem clock.
Caution 2. When shifting to the STOP mode, be sure to stop the peripheral hardware operation operating
with main system clock before executing STOP instruction (except SNOOZE mode setting unit).
Caution 3. When using the A/D converter in the SNOOZE mode, set up A/D converter mode register 2
(ADM2) before switching to the STOP mode. For details, see 13.3 Registers Controlling A/D
Converter.
Caution 4. The following sequence is recommended for operating current reduction of the A/D converter
when the standby function is used: First clear bit 7 (ADCS) and bit 0 (ADCE) of A/D converter
mode register 0 (ADM0) to 0 to stop the A/D conversion operation, and then execute the STOP
instruction.
Caution 5. It can be selected by the option byte whether the low-speed on-chip oscillator continues
oscillating or stops in the HALT or STOP mode. For details, see CHAPTER 26 OPTION BYTE.
20.2 Registers controlling standby function
The registers which control the standby function are described below.
• Subsystem clock supply mode control register (OSMC)
• Oscillation stabilization time counter status register (OSTC)
• Oscillation stabilization time select register (OSTS)
Remark For details of registers described above, see CHAPTER 6 CLOCK GENERATOR. For registers which
control the SNOOZE mode, CHAPTER 13 A/D CONVERTER.
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