ht9200a.asm

ht9200a as a dtmf generator

;HT9200A驱动程序
;
entone	equ 2	;rc  HT9200A使能，低有效
tonedat equ 1	;rc  HT9200A数据端
toneclk equ 0	;rc  HT9200A时钟端，下降沿锁存数据
;
temp0	 equ 70h
temp1	 equ 71h
temp2	 equ 72h
temp3	 equ 73h
temp4	 equ 74h
temp5	 equ 75h
temp6	 equ 76h
temp7	 equ 77h
;----------------------------------------------------------
	org 000h
	goto main_program
;--------------------------------------------------------
;	 the son-program area
;--------------------------------------------------------
	org 005h
;--------------------------------------------------------
;-----------------------------
delay_200ms
	movlw .200
	movwf temp6
	goto delay_public
delay_100ms
	movlw .100
	movwf temp6
	goto delay_public
delay_40ms
	movlw .40
	movwf temp6
	goto delay_public
delay_30ms
	 movlw .30
	 movwf temp6
	 goto delay_public
delay_10ms
	movlw .10
	movwf temp6
	goto delay_public
delay_6ms
	movlw .6
	movwf temp6
	goto delay_public
delay_1ms
	movlw .1
	movwf temp6
delay_public
	movlw .223
	movwf temp7
public_2
	clrwdt
	decfsz temp7,1
	goto public_2
	decfsz temp6,1
	goto delay_public
	return
;-----------------------------
;-----------------------------
dialout
	nop
	movlw .5		;bit0~bit4 total 5bit∕﹚ 0~abcd
	movwf temp2
dialout_1
	bsf rc,tonedat
	btfss temp1,0
	bcf rc,tonedat
	nop
	nop
	nop
	nop
	bcf rc,toneclk
	nop
	nop
	nop
	nop
	nop
	nop
	bsf rc,toneclk
	nop
	nop
	clrc
	rrf temp1,1
	decfsz temp2,1
	goto dialout_1
	return
;*********************************************
;
dial
	bcf rc,entone
	call delay_200ms
	movlw 40h
	movwf f4	
dial_1
	movf f0,w
	movwf temp0
	skpnz
	goto loop_1
	movlw 0dh    ;delay
	clrz
	xorwf temp0,w
	skpz
	goto dial_2
	incf f4
	bsf f3,5
	movlw 0eh
	movwf 81h
	bcf f3,5	;1.25s
	clrf intcon
	sleep
	bsf f3,5
	movlw 0fh
	movwf 81h
	bcf f3,5	;2.5s
	clrf intcon
	sleep
	call delay_100ms
	goto dial_1
;
dial_2
	movf temp0,w
	movwf temp1
	call dialout
	call delay_100ms
	movlw 1fh
	movwf temp1
	call dialout
	movf temp0,w
	movlw 0ch    ;#
	clrz
	xorwf temp0,w
	skpnz
	goto dial_3
	call delay_100ms
	incf f4
	goto dial_1
dial_3
	bsf f3,5
	movlw 0eh
	movwf 81h
	bcf f3,5	;1.25s
	clrf intcon
	sleep
	call delay_100ms
	incf f4
	goto dial_1
;
	bsf rc,entone
	return
;-----------------------------
;	the mainprogram area
;-----------------------------
main_program
	bsf f3,5
	movlw 0fh
	movwf 81h
	movlw 00h
	movwf trisc
	bcf f3,5	   ;bank 0
	movlw 0ffh
	movwf rc
reset_delay
	movlw 20h
	movwf f4
next
	clrf f0
	incf f4,1
	movlw 80h		;clr 20h--7fh ram
	clrz
	xorwf f4,w
	skpz
	goto next
;
	clrf intcon
;
	movlw 0ah
	movwf 40h
	movwf 4ah
	movlw 03h
	movwf 41h
	movlw 07h
	movwf 42h
	movlw 09h
	movwf 43h
	movwf 48h
	movlw 0dh
	movwf 44h
	movlw 03h
	movwf 45h
	movwf 46h
	movlw 01h
	movwf 47h
	movlw 06h
	movwf 49h
	movlw 02h
	movwf 4bh
	movlw 0ch
	movwf 4ch
;
	call dial
;
loop
	call delay_100ms
	goto loop