Hi Everyone.

I think I'm learning a lot with all the documentation I read, and your help.

The point:

Im trying to build a program who sents a set of bytes via one pin of the P1. This means I need to send the first bit, and the second....till the last bit, and after that begin with the next byte.

What I'm doing is putting those bytes in memory and then sending one by one to p1, rotating the accumulator.

At this time I'm able to send the first byte ok, but I have some troubles with the rest of them.

one question is: Can I store those fixed bytes somewhere in the eeprom?? (look at the label head1 on the code, I'm using a MOV because a didn't find yet a better way to do it, but this is code, not fixed data and I will lose some time to execute this part)

Also I'm using an interrupt in order to reestart from the begining.

So basicly this program will receive a clock pulse on p3.4 and with every 1 to 0 transition will send a bit. If the program receives an INT0 the program will restart from the begining.

I think I'm doing something wrong with the HEAD1 label and forward instructions.

Here is my code:

CNT EQU 70H ;Byte count variable
BIT EQU 69H ;Bit Count variable
BYTE EQU 68H ;Temporary byte variable



ORG 0000H
JMP INICIO

ORG 0003H ;INTERRUPT ROUTINE WILL RESTORE THE DATA FROM THE BEGINING
MOV R0,#41H
MOV BYTE,@R0
MOV BIT,#0H
MOV A,BYTE
RL A
MOV BYTE,A
RETI

ORG 0030H ;MAIN PROGRAM

INICIO: MOV BIT,#0H
MOV R0,#41H
MOV P3,#FFH
MOV P1,#00H
MOV BYTE,@R0
MOV IE,#81H ;ENABLE INT0
MOV TCON,#00H ;ENABLE LEVEL TRIGGER FOR INT0

HEAD1: MOV 41H,#B8H ;HERE IS THE LIST OF BYTES WE WILL SEND
MOV 42H,#80H
MOV 43H,#A6H
MOV 44H,#10H
MOV 45H,#DH
MOV 46H,#7H
MOV 47H,#E1H
MOV 48H,#4BH
MOV 49H,#6H
MOV 50H,#4CH
MOV 51H,#32H
MOV 52H,#59H
MOV 53H,#FFH





CICLO: JB P3.4, CICLO ;wait a falling edge on P3.0
NOP
MOV A,BYTE
MOV P1, A
MOV BYTE,A
INC BIT
MOV A,BIT
CJNE A,#07H,CICLO2
MOV BIT,#0H
INC R0
MOV BYTE,@R0
CJNE R0,#BH,CICLO2
MOV R0,41H
MOV BYTE,@R0
MOV A,BYTE
RR A
MOV BYTE,A


CICLO2: JNB P3.4, CICLO2 ; wait leading edge on P3.0
MOV A,BYTE
RL A
MOV BYTE,A
NOP
AJMP CICLO