ST7LITE3 datasheet(165/167 Pages) STMICROELECTRONICS

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ST7LITE3

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IMPORTANT NOTES (Cont’d)

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 will be generat-

ed on each data byte reception.

Workaround

The problem can be detected in the LINSCI inter-

rupt 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 register. If RWU

is cleared, it can be set by software. Refer to Fig-

ure 108. Workaround is shown in bold characters.

Figure 108. LINSCI Interrupt routine

@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

ST7LITE3 数据表(PDF) 165 Page - STMicroelectronics

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