HSE in BAM mode in STM32H7

[Evgeny Erlihman]

Posted on October 23, 2017 at 22:19

Hello,

I want to use the BAM mode, and more specifically, D1/D2 in DSTANDBY, while D3 is in RUN mode. In this mode i want to have ADC3 sampling 3 channels, and transfer the results to RAM using BDMA. From what i can understand i need a LPTIM to trigger the ADC3.  I might need a higher sampling rate than the ones LSI/LSE (32k) can provide. I see that i can use HSE through PER_CLK to clock LPTIM.

My question, is it possible to use HSE in BAM mode? The reason i am asking is that there is nothing specific about clock behavior in BAM mode, only in RUN & STOP/STANDBY, and as i understand BAM is in between......

Thanks,

Evgeny

#bam #stm32h7 #adc #dma-adc #adc-trigger #low-power #hse

[Evgeny Erlihman · Accepted solution]

Posted on November 29, 2017 at 15:35

Using

 a bare metal example from ST that does what is described above, i can see that HSE is still functioning in this mode. This can be concluded from the RM as well, as the HSE is located inside V

DD

domain.