RTC battery supply switch disabled

[simooon442]

Hello.
After each pcb RST (POR or not), the RTC is resetted, because VBTCR1.BPWSWSTP bit is set to 1 after each pcb reset (renesas datasheet section 11.2.1).

I suspect Arduino settings to automatically set this bit at each pcb power restart. How to deactivate it so we can use the RTC function normally ?

We need this VBTCR1.BPWSWSTP bit to be setting at 0 when PCB powering on, otherwise, RTC function is unusable.

[gpb01]

Temporary detour ... try adding the following lines immediately after setup():

R_SYSTEM->PRCR    = 0xA502;
R_SYSTEM->VBTCR2  = 0x80;
R_SYSTEM->VBTCR1  = 0x00;
R_SYSTEM->PRCR    = 0xA500;

... the battery should now be working ;-)

Guglielmo