inaccurate frequency using TMR1 PI18F452

[sayzer]

Let me edit a small part.

@Timer1 = TMR1L
Timer1  VAR  WORD EXT

Disable  
miint:
	IF PIR1.0 = 1 THEN
		T1CON.0 = 0
		Timer1 = Timer1 + FRECUENCIA
		T1CON.0 = 1

		IF ARRANCA_MOTOR = 1 THEN
			PORTC.5 = 0	'PULSO DE STEP
			PORTA.5 = 0	'SALIDA PARA SHAFT
			PORTA.5 = 1	'SALIDA PARA SHAFT
			PORTC.5 = 1	'PULSO DE STEP
		ELSE
			IF EMULACION = 1 THEN TRIGGER = ACTIVA_PRESENCIA 

		ENDIF
	'*********************************************************
	PIR1.0 = 0
	ENDIF
	'**************** INTERRUPCION POR TIMER 0  **************
	
salida1:
	Resume                 ' retorna al programa principal
 	Enable
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