adcpin.asm

于ADuC812的智能无功补偿控制器的研制 一种眼科B型超声诊断议 SL11R单片机外部存储器扩展 单片机复位电路...支持键盘双击事件的C程序设计! 一些源程序 FrankLin C51 库函数的一

;********************************************************************
;
; Author        : ADI - Apps            www.analog.com/MicroConverter
;
; Date          : April 2002
;
; File          : ADCpin.asm
;
; Hardware      : ADuC814
;
; Description   : Performs hardware pin driven ADC conversions and
;                 outputs results on the UART  Continuously flashes
;                 LED (independently of ADC routine) at approximately
;                 5Hz (assuming an 2.097152 MHz Mclk).
;		
;********************************************************************

$MOD814                         ; Use 8052&ADuC814 predefined symbols

LED     EQU     P3.3            ; P3.3 drives red LED on eval board
CHAN    EQU     0               ; convert this ADC input channel..
                                ; ..chan values can be 0 thru 8
;____________________________________________________________________
                                                  ; BEGINNING OF CODE
CSEG

ORG 0000h

        JMP     MAIN            ; jump to main program
;____________________________________________________________________
                                             ; INTERRUPT VECTOR SPACE
ORG 0033H ; (ADC ISR)
        MOV A,ADCDATAH
	CALL SENDVAL
	MOV A,ADCDATAL
	CALL SENDVAL	
        RETI

;====================================================================
                                                       ; MAIN PROGRAM
ORG 004Bh

MAIN:

; Set up UART
	MOV     RCAP2H,#0FFh ; config UART for 9600 baud
        MOV     RCAP2L,#-7   ; 
        MOV     TH2,#0FFh
        MOV     TL2,#-7
        MOV     SCON,#52h
        MOV     T2CON,#34h
; PRECONFIGURE...

        MOV     ADCCON1,#080h   ; power up ADC 
        MOV     ADCCON2,#CHAN   ; select channel to convert

; LAUNCH CONTINUOUS CONVERSIONS...

        SETB	EA              ; enable interrupts
        SETB    EADC            ; enable ADC interrupt
        ORL     ADCCON1,#001h   ; enable hardware CONVST pin

; CONTINUE WITH OTHER CODE...

AGAIN:  CPL     LED             ; blink (complement) the LED
        MOV     A,#01H		; delay length
	CALL    DELAY           ; delay 100ms
        JMP     AGAIN           ; repeat

; the micro is free to continue with other tasks (flashing the LED in
; this case) while the ADC is converting, synchronously to the
; external CONVST pin.  results are being handled by the ADC
; interrupt service routine.

;____________________________________________________________________
                                                         ; SUBROUTINE
DELAY:					; Delays by 100ms * A
					; 100mSec based on 2.097152MHZ 
					; Core Clock 
					; i.e. default ADuC814 Clock

		MOV	R1,A		; Acc holds delay variable
 DLY0:		MOV	R2,#022h	; Set up delay loop0
 DLY1:		MOV	R3,#0FFh	; Set up delay loop1
		DJNZ	R3,$		; Dec R3 & Jump here until R3 is 0
		DJNZ	R2,DLY1         ; Dec R2 & Jump DLY1 until R2 is 0
		DJNZ	R1,DLY0		; Dec R1 & Jump DLY0 until R1 is 0
		RET			; Return from subroutine

;____________________________________________________________________

$INCLUDE(UARTIO.ASM)
END