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Transmitter/Receiver delay subroutine using TMR0

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tschen

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;2.5s DELAY
DELAY1: CLRF TMR0 ;START TMR0
LOOPA MOVF TMR0,W ;READ TMR0 INTO W
SUBL .9766 ;TIME - W
BTFS STATUS,Z ;CHECK TIME - W = 0
GOTO LOOPA
RETLW 0 ;RETURN AFTER TMR0=>(1MHz/256) = 3906.25Hz

I'm using TLP/RLP 434A conncted to PIC16F877A with 4MHz external clock. I intend to send a pulse using the delay subroutines. 2.5s represents a logic 0, 5s for logic 1 and 7.5s for a start bit.

I tested the .asm codes on the breadboard and it seems that the pulse is not generated. Why is that???
 

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