Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
997
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
9 - If the MCx flag in the INTFLAG register is set when enabling the DMA,
this will trigger an immediate DMA transfer and overwrite the current
buffered value in the TCC register. Errata reference: 12155
this will trigger an immediate DMA transfer and overwrite the current
buffered value in the TCC register. Errata reference: 12155
Fix/Workaround:
None
39.3 Revision C
39.3.1 Device
1 - PA24 and PA25 cannot be used as input when configured as GPIO with
continuous sampling (cannot be read by PORT). Errata reference: 12005
continuous sampling (cannot be read by PORT). Errata reference: 12005
Fix/Workaround:
- Use PA24 and PA25 for peripherals or only as output pins.
- Or configure PA31 to PA24 for on-demand sampling (CTRL[31:24] all zeroes)
and access the IN register through the APB (not the IOBUS), to allow waiting for
on-demand sampling.
and access the IN register through the APB (not the IOBUS), to allow waiting for
on-demand sampling.
2 - While the internal startup is not completed, PA07 pin is driven low by the
chip. Then as all the other pins it is configured as an High Impedance pin.
Errata reference: 12118
chip. Then as all the other pins it is configured as an High Impedance pin.
Errata reference: 12118
Fix/Workaround:
None
3 - If APB clock is stopped and GCLK clock is running, APB read access to
read-synchronized registers will freeze the system. The CPU and the DAP
AHB-AP are stalled, as a consequence debug operation is impossible.
Errata reference: 10416
read-synchronized registers will freeze the system. The CPU and the DAP
AHB-AP are stalled, as a consequence debug operation is impossible.
Errata reference: 10416
Fix/Workaround:
Do not make read access to read-synchronized registers when APB clock is
stopped and GCLK is running. To recover from this situation, power cycle the
device or reset the device using the RESETN pin.
stopped and GCLK is running. To recover from this situation, power cycle the
device or reset the device using the RESETN pin.
4 - If the external XOSC32K is broken, neither the external pin RST nor the
GCLK software reset can reset the GCLK generators using XOSC32K as
source clock. Errata reference: 12164
GCLK software reset can reset the GCLK generators using XOSC32K as
source clock. Errata reference: 12164
Fix/Workaround:
Do a power cycle to reset the GCLK generators after an external XOSC32K
failure.
failure.