Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Hoja De Datos

792

SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]

11063K–ATARM–05-Nov-13

If the Frame Slot Mode is disabled (FSDIS = 1) and a frame transfer has been completed, the TXRDY flag is set again
immediately.

The TFrame_Maximum is calculated as below:

If the Checksum is sent (CHKDIS = 0):



THeader_Nominal = 34 x Tbit



TResponse_Nominal = 10 x (NData + 1) x Tbit



TFrame_Maximum = 1.4 x (THeader_Nominal + TResponse_Nominal + 1)



TFrame_Maximum = 1.4 x (34 + 10 x (DLC + 1 + 1) + 1) x Tbit



TFrame_Maximum = (77 + 14 x DLC) x Tbit

If the Checksum is not sent (CHKDIS = 1):



THeader_Nominal = 34 x Tbit



TResponse_Nominal = 10 x NData x Tbit



TFrame_Maximum = 1.4 x (THeader_Nominal + TResponse_Nominal + 1)



TFrame_Maximum = 1.4 x (34 + 10 x (DLC + 1) + 1) x Tbit



TFrame_Maximum = (63 + 14 x DLC) x Tbit

Note:

1.

The term “+1” leads to an integer result for TFrame_Max (LIN Specification 1.3).

This error is generated in Master of Slave node configuration, when the USART is transmitting and if the transmitted
value on the Tx line is different from the value sampled on the Rx line. If a bit error is detected, the transmission is
aborted at the next byte border.

This error is reported by flag LINBE in the Channel Status Register (US_CSR). 

This error is generated in Slave node configuration, if the Synch Field character received is other than 0x55.

This error is reported by flag LINISFE in the US_CSR.

This error is generated in Slave node configuration, if the parity of the identifier is wrong. This error can be generated
only if the parity feature is enabled (PARDIS = 0).

Break

Synch

Protected

Identifier

Data N

Checksum

Header

Inter-

frame

space

Response

space

Frame

Frame slot = TFrame_Maximum

Response

TXRDY

Write
US_THR

Write
US_LINID

Data 1

Data 2

Data 3

Data3

Data N-1

Data N

Frame Slot Mode

Disabled

Frame Slot Mode

Enabled

LINTC

Data 1