ATtiny167-ESSZ datasheet(167/282 Pages) ATMEL

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167

7728D–AVR–07/09

ATtiny87/ATtiny167

15.4.5

Enable / Disable

Setting the LENA bit in LINCR register enables the LIN/UART controller. To disable the

LIN/UART controller, LENA bit must be written to 0. No wait states are implemented, so, the

disable command is taken into account immediately.

15.4.6

LIN Commands

Clearing the LCMD[2] bit in LINCR register enables LIN commands.

As shown in Table 15-1 on page 167, four functions controlled by the LCMD[1..0] bits of

LINCR register are available (c.f. Figure 15-5 on page 166).

15.4.6.1

Rx Header / LIN Abort Function

This function (or state) is mainly the withdrawal mode of the controller.

When the controller has to execute a master task, this state is the start point before enabling a

Tx Header command.

When the controller has only to execute slave tasks, LIN header detection/acquisition is

enabled as background function. At the end of such an acquisition (Rx Header function), auto-

matically the appropriate flags are set, and in LIN 1.3, the LINDLR register is set with the

uncoded length value.

This state is also the start point before enabling the Tx or the Rx Response command.

A running function (i.e. Tx Header, Tx or Rx Response ) can be aborted by clearing

LCMD[1..0] bits in LINCR register (See ”Break-in-data” on page 177.). In this case, an abort

flag - LABORT - in LINERR register will be set to inform the other software tasks. No wait

states are implemented, so, the abort command is taken into account immediately.

Rx Header function is responsible for:

• The BREAK field detection,

• The hardware re-synchronization analyzing the SYNCH field,

• The reception of the PROTECTED IDENTIFIER field, the parity control and the update of

the LINDLR register in case of LIN 1.3,

• The starting of the Frame_Time_Out,

• The checking of the LIN communication integrity.

Table 15-1.

LIN/UART Command List

LENA

LCMD[2]

LCMD[1]

LCMD[0]

Command

Comment

Disable peripheral

Rx Header - LIN Abort

LIN Withdrawal

Tx Header

LCMD[2..0]=000 after Tx

Rx Response

LCMD[2..0]=000 after Rx

Tx Response

LCMD[2..0]=000 after Tx

Byte transfer

no CRC, no Time out

LTXDL=LRXDL=0

(LINDLR: read only register)

Rx Byte

Tx Byte

Full duplex

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