Datasheet

SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
818
Master Node Configuration
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 FSDIS 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).
Figure 35-52. Master Node with PDC (PDCM = 1)
Figure 35-53. Master Node with PDC (PDCM = 0)
Slave Node Configuration
|
|
|
|
|
|
|
|
NACT
PARDIS
CHKDIS
CHKTYP
DLM
FSDIS
DLC
IDENTIFIER
DATA 0
DATA N
WRITE BUFFER
(Peripheral) DMA
Controller
(Peripheral) DMA
Controller
USART3
LIN CONTROLLER
APB bus
NACT
PARDIS
CHKDIS
CHKTYP
DLM
FSDIS
DLC
IDENTIFIER
DATA 0
DATA N
WRITE BUFFER
RXRDY
TXRDY
TXRDY
USART3
LIN CONTROLLER
APB bus
READ BUFFER
NODE ACTION = PUBLISH NODE ACTION = SUBSCRIBE
|
|
|
|
RXRDY
TXRDY
TXRDY
APB bus
USART3
LIN CONTROLLER
DATA 0
DATA N
|
|
|
|
WRITE BUFFER
USART3
LIN CONTROLLER
READ BUFFER
NODE ACTION = PUBLISH NODE ACTION = SUBSCRIBE
APB bus
IDENTIFIER
DATA 0
DATA N
WRITE BUFFER
IDENTIFIER
(Peripheral) DMA
Controller
(Peripheral) DMA
Controller