Rainbow-electronics ATmega64C1 Manuel d'utilisateur télécharger pdf (Page 216)

216

7647A–AVR–02/08

ATmega32/64/M1/C1

ever, 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 max-

imum length T

Frame_Maximum

by any slave task upon transmission of the SYNCH and IDENTI-

FIER fields (see Section 17.5.10 “Frame Time Out” on page 216).

• 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

) as illustrated in Figure 17-11 on page 215.

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

17.5.10 Frame Time Out

According to the LIN protocol, a frame time-out error is flagged if: T

Frame

> T

Frame_Maximum

. This

feature is implemented in the LIN/UART controller.

Figure 17-12. LIN timing and frame time-out

17.5.11 Break-in-data

According to the LIN protocol, the LIN/UART controller can detect the BREAK/SYNC field

sequence even if the break is partially superimposed with a byte of the response. When a

BREAK

Field

SYNC

Field

CHECKSUM

Field

DATA-0

FieldField

IDENTIFIER

PROTECTED

DATA-n

Field

T ResponseT Header

T Frame

T Header_Maximum

T Header_Maximum + T Response_Maximum

1.4 x

T Header_Nominal

1.4 x

T Response_NominalT Response_Maximum

T Frame_Maximum

Maximun before Time-out

T Header_Nominal

T Header_Nominal + T Response_Nominal

34 x

T Bit

10 ( Number_of_Data + 1 ) x

T BitT Response_Nominal

T Frame_Nominal

Nominal

1 2 ... 211 212 213 214 215 216 217 218 219 220 221 ... 365 366

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Rainbow-electronics ATmega64C1 Manuel d'utilisateur Page 216

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