Dan, I made this code I tried to make it work, but I had the following problems.

1) the 8051 runs out of stack
2) I´m not able to use constants defines by equ

its not very long, if you realize what i´m doing wrong
please let me know
thanks a lot


.ORG 0H ;locate routine at 00H
AJMP START ;jump to START
.ORG 03H ;external interrupt 0
RETI
.ORG 0BH ;timer 0 interrupt
RETI
.ORG 13H ;external interrupt 1
RETI
.ORG 1BH ;timer 1 interrupt
RETI
.ORG 23H ;serial port interrupt
ACALL START_SENDING
.ORG 25H ;locate beginning of rest of program

;INICIO_TABLA EQU $40
;FIN_TABLA EQU $FF

SEND:
MOV SBUF, A ;Transmit Byte
WAIT:
JNB TI, WAIT ;Wait for transmission to be completed.
CLR TI ;Clear Transmit Flag
RET

START_SENDING: ;Main program (on power up, program jumps to this point)

PUSH ACC
PUSH PSW
;Set up control registers
MOV PCON,#$80 ;to double baud rate
MOV TH1, #0FDH ;Set up for 9600 baud rate
MOV SCON, #01010000B ;Mode = 8 bit UART
MOV TMOD, #00100001B ;Sets Timer1 to 8 bit auto reload
MOV TCON, #01000000B ;Turns Timer1 on
;MOV R0,INICIO_TABLA
MOV R0,#$40
LOOP:
MOV A,@R0 ;Move Value in R0 to A (to be sent)
CALL SEND ;Send Value to PC
INC R0 ;Increase the 8 bit value of R1 by 1
MOV A,R0
;CJNE A,FIN_TABLA,LOOP ;Go to LOOP(jump back to point labeled LOOP)
CJNE A,#$FF,LOOP
POP PSW
POP ACC
RETI ;End program



START:
MOV IE,#$90
JMP $
END