;	MODEL		miniDATA0131	Version 0.01  2015/10/11
;	Author		miniDATA
;
;	PIC Marker@500KHz
;	for PIC12F675 VXO clock:20MHz
;
;	PIN assign 12F675
;		PIN1 VDD		+5V (USE 20MHz CLOCK)
;		PIN2 OSC1		Crystal IN
;		PIN3 OSC2		Crystal IN
;		PIN4 GP3		Not used
;		PIN5 GP2		Not used
;		PIN6 GP1		Not used
;		PIN7 GP0		MARKER 500KHz OUT
;		PIN8 VSS		GND
;
		LIST	P=PIC12F675, t=ON ,c=192,b=4,r=dec
		INCLUDE	P12F675.INC
		__CONFIG _HS_OSC&_WDT_OFF&_PWRTE_ON&_BODEN_ON&_MCLRE_OFF&_PWRTE_OFF

		org	0							;Reset vector
		goto	init
		org	4							;Interrupt vector
ISR
		retfie

init
        bsf     STATUS,RP0
		clrf    ANSEL
		movlw   B'00000000'
		movwf   TRISIO

		bcf     STATUS,RP0
        movlw   B'00000111'     
        movwf   CMCON           

main
		bcf		GPIO,0			;apply the current to GPIO,0bit
		nop
		nop
		nop
		nop
								;5*4 = 20CLOCK

 
		bsf		GPIO,0			;Cut the current GPIO,0bit
		nop
		nop
		goto	main
								;3*4 + 8(JMP) = 20CLOCK

		end