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C21: help configuring TCC for two outputs waveform generator
I need to generate two synchronized waveform on two output pins. They are two PWM, for example 100us ON, 900us OFF. It's simple to configure TCC to generate PWM on one output....
Tuesday, 26 May 2020 - 11:26
SAM D20: DFLL48 in closed or open loop mode?
I'm using an external 32.768kHz crystal that I will use for RTC too (so it should have a high accuracy). I'm trying to use it as the reference for DFLL48 in closed-loop mode. As I...
Saturday, 2 March 2019 - 15:09
SAMD20 and DFLL48 with external 32k crystal: fine lock sometime isn't reached
I have a custom board with SAMD20 MCU with external 32kHz crystal connected to XOSC32k (PA00 and PA01). I'm using Atmel Software Framework code (3.45) for clock initialization. I...
Friday, 1 March 2019 - 11:55
DFLL48M in SAMD20: how it works?
I configured DFLL48M as usual: XOSC32K enabled and used as the reference for DFLL48M, configured in closed-loop mode with a multiplication factor of 48000000/32768. It works....
Friday, 10 August 2018 - 07:34
How to connect an external 32.768kHz clock signal to SAM D20
I have a 32.768kHz clock signal (that comes from a GCLK_IO pin of another SAM D20) that I'd like to use as a clock reference for a SAM D20.   I may connect it to XIN32 ...
Monday, 28 May 2018 - 12:51
SAM D20 maximum voltage of ADC reference
Datasheet says the maximum voltage for the ADC external reference is VDDANA-0.6V, that is 2.7V if VDDANA=3.3V. Of course this maximum voltage applies to ADC inputs too.  ...
Friday, 4 May 2018 - 11:09
Bus stall: how to detect
Is it possible to detect if a bus stall happens?   If it happens, everything appears to work as usual. However it is interesting if there's a bit or interrupt to check...
Thursday, 3 May 2018 - 09:50
SAMD20: again on register synchronization and bus stall
This topic is very difficult to me and everytime I have many doubts.   I need to avoid bus stall in every situations. This mainly because during bus stall pending interrupt...
Thursday, 3 May 2018 - 09:29
SAMD20: How to use OSC32K 32kHz and 1kHz outputs
The datasheet lacks some info. It seems from ASF code that OSC32K in SAMD20 has two outputs: 32.768kHz and 1.024kHz. It seems they could be activated at the same time:  ...
Thursday, 3 May 2018 - 08:28
ASFv3 vs ASFv4/START
A couple of years ago I started with Atmel SAM devices and I meet ASF technology. I didn't like it at first, and I don't like it now that is named ASFv3. I don't use full-ASF code...
Tuesday, 1 May 2018 - 06:49
D20: Read COUNT32 value from TC0/TC1
I know I need to wait for syncing before reading from COUNT32 register. So I need something similar to this:   while (tc_is_syncing(module_inst)) {   /* Wait for sync...
Thursday, 26 April 2018 - 09:27
D20: Create a 64-bits hw timer from 4 TC peripherals
I configured TC0/TC1 and TC2/TC3 as two 32-bits counters. The first couple of TCs counts clock pulses at a frequency rate of 1MHz. The second couple TC2/TC3 counts output...
Thursday, 26 April 2018 - 08:26

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