first thanks every one who is helping...now with the code i got from neil, and looking at the sdi pin on the scope i only get one data xfer. the pgm is not looping until i reset then only one xfer. why. the code is saying to jump to main but i don't think it is. not to mention i still don't know how to write the check check sum code. ron.
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;................................................
;NEW CODE FROM NEIL WITH CHKSUM
;2/19/05
;................................................




$MOD812
LOOPCOUNT DATA 44H ;COUNT LOOPS
LED EQU P3.4 ;IS LED



; configure the UART ADuC812
MOV SCON,#52h ; configure UART for 9600baud..
MOV TMOD,#20h ; ..assuming 11.0592MHz crystal
MOV TH1,#-3
SETB TR1 ; ok this works

MAINLOOP:

;... THIS THE RIGHT PLACE FOR THIS?.....................

JNB RI,$ ; Recive serial data
MOV R0,SBUF ; Store data in IN MEMORY
JNB RI,$ ; Recive serial data
MOV R1,SBUF ; Store data in IN MEMORY
;.........................................................

;Do Check SUM.....IF CHKSUM IS #FFH...???
; R0 = #FFH <?????
; AJMP MAINLOOP ; Start over if bad

;CSUM GOOD
; move address and data into R0,R1
ACALL LD_8802;
; repeat for all DACs

AJMP MAINLOOP ; Start over

LD_8802:
ORL P2,#11110000B ;SET CLK,CS,SHDN HIGH
CLR P2.5 ;SET CHIP SELECT LOW
MOV LOOPCOUNT,#4 ;ADDRESS IS 4 BITS
MOV A,R0 ;GET DAC ADDRESS
RR A ;ROTATE THE DAC
RR A ;ADDRESS TO MOST
RR A ;SIGNIFCANT BIT (MSB)
RR A
ACALL SEND_SERIAL ;SEND THE ADDRESS
MOV LOOPCOUNT,#8 ;DO 8 BIT OF DATA
MOV A,R1
ACALL SEND_SERIAL ;SEND THE DATA
SETB P2.5 ;SET CS HIGH
RET ;DONE


SEND_SERIAL: RLC A ;MOVE NEXT BIT TO CARRY
CPL LED ;BLINK LED
MOV P2.7,C ;MOVE DATA TO SDI
CLR P2.6 ;PULSE THE
SETB P2.6 ;CLK INPUT
DJNZ LOOPCOUNT,SEND_SERIAL ;LOOP IF NOT DONE
RET ;DONE
END
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