ST7MC1K2-Auto datasheet(365/371 Pages) STMICROELECTRONICS

365 / 371 page

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ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

Known limitations

365/371

Figure 165. Header reception event sequence

Impact on application

Software may execute the interrupt routine twice after header reception.

Moreover, in reception mode, as the receiver is no longer in mute mode, an interrupt is

generated on each data byte reception.

Workaround

The problem can be detected in the LINSCI interrupt routine. In case of timeout error (LHE

is set and LHLR is loaded with 00h), the software can check the RWU bit in the SCICR2

shown in bold characters.

Figure 166. LINSCI interrupt routine

LIN synch

Identifier

field

break

Theader

Active mode is set

RDRF flag is set

Critical

window

ID field STOP bit

(RWU is cleared)

@interrupt void LINSCI_IT ( void ) /* LINSCI interrupt routine */

{

/* clear flags */

SCISR_buffer = SCISR;

SCIDR_buffer = SCIDR;

if ( SCISR_buffer & LHE )/* header error ? */

{

if (!LHLR)/* header time-out? */

{

if ( !(SCICR2 & RWU) )/* active mode ? */

{

_asm("sim");/* disable interrupts */

SCISR;

SCIDR;/* Clear RDRF flag */

SCICR2 |= RWU;/* set mute mode */

SCISR;

SCIDR;/* Clear RDRF flag */

SCICR2 |= RWU;/* set mute mode */

_asm("rim");/* enable interrupts */

}

Example using cosmic compiler syntax

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