AN413 datasheet(42/45 Pages) STMICROELECTRONICS

42 / 45 page

Examples of SCI configurations

AN413

42/45

Doc ID 1875 Rev 2

and S_ISR,#~rxdp ; Reset receiver data pending flag.

popuw RPP

; restore register pointer pair

popu PPR

; restore page pointer

iret

;*************************************************************************

; TRA_HOLD: End of DMA transmitter Interrupt

; Function:

;

- Check Interrupt source.

;

- Disable DMA mask .

;

- Enable Receiver interrupt mask.

TRA_HOLD:

pushu PPR ; save page pointer.

pushuw RPP ; save register pointer pair.

spp #SCI1_PG ; SCI register page.

srp #BK_F ; To address SCI registers with r.

tm s_imr,#txeob

if [SETZ] { ; If a Transmitter End Of Block interrupt.

bres S_txeob ; Dis. Transmit end of block pending bit.

bres S_txhem ; Reset transmit holding reg. empty .

ld s_imr,#~( rxdi | rxe)

; Unmask Receiver data interrupt.

; Unmask Receiver data error interrupt.

; Mask Transmitter data interrupt.

} else {

jx RESET_START ; If not a normal interrupt source.

} ;—- end of if.

popuw RPP ; restore register pointer pair

popu PPR ; restore page pointer

iret

AN413 Datasheet(PDF) 42 Page - STMicroelectronics