AN413 datasheet(41/45 Pages) STMICROELECTRONICS

41 / 45 page

AN413

Examples of SCI configurations

Doc ID 1875 Rev 2

41/45

; Unmask Receiver data interrupt.

; Unmask Receiver data error interrupt.

; Unmask Receiver address interrupt.

; Reset of the pending bits.

ld s_idpr,#PRIORITY_SCI ; Mask transmitter DMA request.

; SCI exeptions priority level.

ld s_brglr,#DIV_9600 ; BRG divisor for 9600 bauds, start SCI

; !!! with a 24 Mhz external clock,

; !!! or 4800 Bds (12 MHz external clock.)

} ;—- end of proc.

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

; SYNC_COM:

proc SYNC_COM {

spp #SCI1_PG

srp #BK_F

ld R#NUM_TDAP,#(DEPART_DMA_SCI) ; DMA pointer initialisation.

ld R#NUM_TDCP,#(LNG_DMA_SCI) ; DMA counter initialisation.

or s_idpr,#txd

; Unmask transmitter DMA request.

; unmask transmitter data interrupt.

ld s_imr,#txdi

; Unmask Transmitter data interrupt.

; Mask Receiver data interrupt.

; Mask Receiver data error interrupt.

} ;—- End of proc.

*********************************************************************

; REC_DATA: Receive interrupt.

REC_DATA:

pushu PPR

; save page pointer.

pushuw RPP

; save register pointer pair.

spp #SCI1_PG

; SCI register page.

srp #BK_SCI

; 16 registers reserved for SCI.

ld data,S_RXBR

; Read the data received.

and data,#07Fh

; Mask the parity bit.

ld rec_ptr(rec_cpt),data ; Storage of the received data.

incw rec_cpt

cpw rec_cpt,#7

; End of the table.

AN413 数据表(PDF) 41 Page - STMicroelectronics

AN413 数据表(HTML) 41 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

数据表下载