Function For Lower Operating Power Consumption; Setting Operating Power Control Mode - Renesas RX100 Series User Manual

RX13T Group
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
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
11. Low Power Consumption
Page 178 of 1041