SAM7X256_14 Datasheet, PDF (628/662 Pages) ATMEL Corporation – ARM-based Flash MCU

41.5.2 Controller Area Network (CAN)
41.5.2.1 CAN: Low Power Mode and Error Frame
If the Low Power Mode is activated while the CAN is generating an error frame, this error frame may be shortened.
Problem Fix/Workaround
None
41.5.2.2 CAN: Low Power Mode and Pending Transmit Messages
No pending transmit messages may be sent once the CAN Controller enters Low-power Mode.
Problem Fix/Workaround
Check that all messages have been sent by reading the related Flags before entering Low-power Mode.
41.5.3 Ethernet MAC (EMAC)
41.5.3.1 EMAC: RMII Mode
RMII mode is not functional.
Problem Fix/Workaround
None
41.5.3.2 EMAC: Possible Event Loss when Reading EMAC_ISR
If an event occurs within the same clock cycle in which the EMAC_ISR is read, the corresponding bit might be cleared
even though it has not been read at 1. This might lead to the loss of this event.
Problem Fix/Workaround
Each time the software reads EMAC_ISR, it has to check the contents of the Transmit Status Register (EMAC_TSR), the
Receive Status Register (EMAC_RSR) and the Network Status Register (EMAC_NSR), as the possible lost event is still
notified in one of these registers.
41.5.3.3 EMAC: Possible Event Loss when Reading the Statistics Register Block
If an event occurs within the same clock cycle during which a statistics register is read, the corresponding counter might
lose this event. This might lead to the loss of the incrementation of one for this counter.
Problem Fix/Workaround
None
41.5.4 Peripheral Input/Output (PIO)
41.5.4.1 PIO: Electrical Characteristics on NRST, PA0-PA30 and PB0-PB26
When NRST or PA0 - PA30 or PB0 - PB26 are set as digital inputs with pull-up enabled, the voltage of the I/O stabilizes
at VPull-up.
Vpull-up
VPull-up Min
VPull-up Max
VDDIO - 0.65 V
VDDIO - 0.45 V
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
628