Data Sheet

1039
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
- 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.
6 - Rx serializer in the RIGHT Data Slot Formatting Adjust mode
(SERCTRL.SLOTADJ clear) does not work when the slot size is not 32 bits.
Errata reference: 13411
Fix/Workaround:
In SERCTRL.SERMODE RX, SERCTRL.SLOTADJ RIGHT must be used with
CLKCTRL.SLOTSIZE 32.
7 - SYSTICK calibration value is wrong. Errata reference: 14154
Fix/Workaround:
right SYSTICK calibration value is 0x40000000.
8 - In Standby, Idle1 and Idle2 sleep modes the device might not wake up
from sleep. An External Reset, Power on Reset or Watch Dog Reset will start
the device again. Errata reference: 13140
Fix/Workaround:
the SLEEPPRM bits in the NVMCTRL.CTRLB register must be written to 3
(NVMCTRL - CTRLB.bit.SLEEPPRM = 3) to ensure correct operation of the
device. The average power consumption of the device will increase with 20uA
compared to numbers in the electrical characteristics chapter.
9 - 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
Fix/Workaround:
None
10 - The voltage regulator in low power mode is not functional at
temperatures above 85C. Errata reference: 12291
Fix/Workaround:
Enable normal mode on the voltage regulator in standby sleep mode.
Example code:
// Set the voltage regulator in normal mode configuration in standby sleep mode
SYSCTRL->VREG.bit.RUNSTDBY = 1;
11 - 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
Fix/Workaround: