ST7LITE3XF2 datasheet(170/173 Pages) STMICROELECTRONICS

Part #	ST7LITE3XF2

Description	8-bit MCU with single voltage Flash, data EEPROM, ADC, timers, SPI, LINSCI?

PDF	173 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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170 / 173 page

ST7LITE3xF2

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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 110. Workaround is shown in bold characters.

Figure 110. 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

ST7LITE3XF2 Datasheet(PDF) 170 Page - STMicroelectronics