Renesas EK-RA6M3 - Operable Long Timer in Software Standby and Deep Software Standby Modes; Application Code Highlights; Clock Source Setup; Handle On-Chip Modules in LPM to Reduce Power Consumption

Renesas RA Family Getting Started with Low Power Applications for RA6 and
RA4 Groups
R11AN0471EU0104 Rev.1.04 Page 23 of 40
Oct.1.21
4.3 Operable Long Timer in Software Standby and Deep Software Standby Modes
The Operable Long Timer Application uses LPM configurations in Software Standby and Deep Software
Standby modes. It disables unused clock and IO ports before entering LPM with the WFI instruction, then
places IO ports back to normal operating condition after waking up as shown in Figure 19.
LPM is canceled by the Operable Long Timer underflow interrupt, which is created by using AGT0 and AGT1
in cascade mode.
Figure 19. Operable Long Timer Process
5. Application Code Highlights
5.1 Clock Source Setup
5.1.1 Handle On-Chip Modules in LPM to Reduce Power Consumption
Oscillators and on-chip modules may be started automatically after MCU reset and be still running in LPM
modes. Therefore, to reduce MCU power consumption, you should disable these modules before entering
LPM.