Техническая Спецификация для Atmel Evaluation Kit AT91SAM9M10-G45-EK AT91SAM9M10-G45-EK

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SAM9M10 [DATASHEET]

6355F–ATARM–12-Mar-13

The user can choose between two PDC modes by the PDCM bit in the LIN Mode register (US_LINMR):

• PDCM = 1: the LIN configuration is stored in the WRITE buffer and it is written by the PDC in the Transmit 

Holding register US_THR (instead of the LIN Mode register US_LINMR). Because the PDC transfer size is 
limited to a byte, the transfer is split into two accesses. During the first access the bits, NACT, PARDIS, 
CHKDIS, CHKTYP, DLM and FDIS are written. During the second access the 8-bit DLC field is written.

• PDCM = 0: the LIN configuration is not stored in the WRITE buffer and it must be written by the user in the LIN 

Mode register (US_LINMR).

The WRITE buffer also contains the Identifier and the DATA, if the USART sends the response (NACT =
PUBLISH).

The READ buffer contains the DATA if the USART receives the response (NACT = SUBSCRIBE).

Master Node with PDC (PDCM=1)

Master Node with PDC (PDCM=0)

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NACT

PARDIS
CHKDIS

CHKTYP

DLM

FSDIS

DLC

IDENTIFIER

DATA 0

DATA N

WRITE BUFFER

PDC

(DMA)

RXRDY

USART3

LIN CONTROLLER

APB bus

NACT

PARDIS
CHKDIS

CHKTYP

DLM

FSDIS

DLC

IDENTIFIER

DATA 0

DATA N

WRITE BUFFER

PDC

(DMA)

RXRDY

TXRDY

USART3

LIN CONTROLLER

APB bus

READ BUFFER

NODE ACTION = PUBLISH

NODE ACTION = SUBSCRIBE

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RXRDY

TXRDY

APB bus

USART3

LIN CONTROLLER

DATA 0

DATA N

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WRITE BUFFER

PDC

(DMA)

USART3

LIN CONTROLLER

READ BUFFER

NODE ACTION = PUBLISH

NODE ACTION = SUBSCRIBE

PDC

(DMA)

RXRDY

APB bus

IDENTIFIER

DATA 0

DATA N

WRITE BUFFER

IDENTIFIER