ATtiny167-ESSZ datasheet(176/282 Pages) ATMEL

176 / 282 page

176

7728D–AVR–07/09

ATtiny87/ATtiny167

15.5.9

xxERR Flags

LERR bit of the LINSIR register is an logical ‘OR’ of all the bits of LINERR register (see Sec-

tion 15.5.13 “Interrupts” on page 178). There are eight flags:

• LBERR = LIN Bit ERRor.

A unit that is sending a bit on the bus also monitors the bus. A LIN bit error will be flagged

when the bit value that is monitored is different from the bit value that is sent. After

detection of a LIN bit error the transmission is aborted.

• LCERR = LIN Checksum ERRor.

A LIN checksum error will be flagged if the inverted modulo-256 sum of all received data

bytes (and the protected identifier in LIN 2.1) added to the checksum does not result in

0xFF.

• LPERR = LIN Parity ERRor (identifier).

A LIN parity error in the IDENTIFIER field will be flagged if the value of the parity bits does

not match with the identifier value. (See LP[1:0] bits in Section 15.6.8 “LIN Identifier

corrupted parity bits and a corrupted identifier. The hardware does not undertake any

correction. However, the LIN slave application has to solve this as:

- known identifier (parity bits corrupted),

- or corrupted identifier to be ignored,

- or new identifier.

• LSERR = LIN Synchronization ERRor.

A LIN synchronization error will be flagged if a slave detects the edges of the SYNCH field

outside the given tolerance.

• LFERR = LIN Framing ERRor.

A framing error will be flagged if dominant STOP bit is sampled.

Same function in UART mode.

• LTOERR = LIN Time Out ERRor.

A time-out error will be flagged if the MESSAGE frame is not fully completed within the

maximum length T

Frame_Maximum by any slave task upon transmission of the SYNCH and

IDENTIFIER fields (see Section 15.5.10 “Frame Time Out” on page 177).

• LOVERR = LIN OVerrun ERRor.

Overrun error will be flagged if a new command (other than LIN Abort) is entered while

‘Busy signal’ is present.

In UART mode, an overrun error will be flagged if a received byte overwrites the byte stored

in the serial input buffer.

• LABORT

LIN abort transfer reflects a previous LIN Abort command (LCMD[2..0] = 000) while ‘Busy

signal’ is present.

After each LIN error, the LIN controller stops its previous activity and returns to its withdrawal

mode (LCMD[2..0] = 000

b) as illustrated in Figure 15-11 on page 175.

Writing 1 in LERR of LINSIR register resets LERR bit and all the bits of the LINERR register.

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