ATtiny167-ESSZ datasheet(174/282 Pages) ATMEL

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174

7728D–AVR–07/09

ATtiny87/ATtiny167

15.5.7.2

Data Length in LIN 1.3

• LRXDL and LTXDL fields are both hardware updated before setting LIDOK by decoding the

data length code contained in the received PROTECTED IDENTIFIER (LRXDL = LTXDL).

• Via the above mechanism, a length of 0 or >8 is not possible.

15.5.7.3

Data Length in Rx Response

Figure 15-9. LIN2.1 - Rx Response - No error

• The user initializes LRXDL field before setting the Rx Response command,

• After setting the Rx Response command, LTXDL is reset by hardware,

• LRXDL field will remain unchanged during Rx (during busy signal),

• LTXDL field will count the number of received bytes (during busy signal),

• If an error occurs, Rx stops, the corresponding error flag is set and LTXDL will give the

number of received bytes without error,

• If no error occurs, LRXOK is set after the reception of the CHECKSUM, LRXDL will be

unchanged (and LTXDL = LRXDL).

15.5.7.4

Data Length in Tx Response

Figure 15-10. LIN1.3 - Tx Response - No error

• The user initializes LTXDL field before setting the Tx Response command,

• After setting the Tx Response command, LRXDL is reset by hardware,

• LTXDL will remain unchanged during Tx (during busy signal),

• LRXDL will count the number of transmitted bytes (during busy signal),

DATA-0

DATA-1

DATA-2

DATA-3

CHECKSUM

LINDLR=0x?4

LCMD2..0=000b

LIN bus

LRXDL (*)

LBUSY

LTXDL (*)

234

1st Byte

2 nd Byte

3 rd Byte

4 th Byte

LIDOK

LRXOK

LCMD=Rx Response

(*) : LRXDL & LTXDL updated by user

DATA-0

DATA-1

DATA-2

DATA-3

CHECKSUM

LCMD2..0=000b

LIN bus

LBUSY

1st Byte

2 nd Byte

3 rd Byte

4 th Byte

LIDOK

LTXOK

LRXDL (*)

234

LCMD=Tx Response

(*) : LRXDL & LTXDL updated by Rx Response or Tx Response task

LTXDL (*)

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