R01UH0822EJ0100 Rev.1.00
Page 178 of 1041
Jul 31, 2019
RX13T Group
11. Low Power Consumption
11.5
Function for Lower Operating Power Consumption
By selecting an appropriate operating power control mode according to the operating frequency and operating voltage,
power consumption can be reduced in normal mode, sleep mode, and deep sleep mode.
11.5.1
Setting Operating Power Control Mode
Examples of the procedures for switching operating power control modes are shown below:
(1) Switching from Normal Power Consumption Mode to Low Power Consumption Mode
From high-speed operating mode to middle-speed operating mode
(High-speed operation in high-speed operating mode)
↓
Set the frequency of each clock to lower than the maximum operating frequency for middle-speed operating mode
↓
Confirm that the OPCCR.OPCMTSF flag is 0 (transition completed)
↓
Set the OPCCR.OPCM[2:0] bits to 010b (middle-speed operating mode)
↓
Confirm that the OPCCR.OPCMTSF flag is 0 (transition completed)
↓
(Middle-speed operation in middle-speed operating mode)
(2) Switching from Low Power Consumption Mode to Normal Power Consumption Mode
From middle-speed operating mode to high-speed operating mode
Middle-speed operation in middle-speed operating mode
↓
Confirm that the OPCCR.OPCMTSF flag is 0 (transition completed)
↓
Set the OPCCR.OPCM[2:0] bit to 0 (high-speed operating mode)
↓
Confirm that the OPCCR.OPCMTSF flag is 0 (transition completed)
↓
Set the frequency of each clock to lower than the maximum operating frequency for high-speed operating mode
↓
High-speed operation in high-speed operating mode