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ALEXANDER PIÑA

This document contains Microchip PIC assembly code that defines processor registers and I/O ports for analog to digital conversion. It configures the ports and registers, performs an ADC conversion by reading the result into port B, then performs a second conversion and reads the result into port C. The code continuously loops through these conversion and reading steps.

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list p=16f877A ; list directive to define processor #include <p16f877A.inc> ; processor specific variable definitions __CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _XT_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF |status equ 0x03 w equ 0x00 trisa equ 0x05 trisb equ 0x06 trisc equ 0x07 trisd equ 0x08 trise equ 0x09 porta equ 0x85 portb equ 0x86 adcon1 equ 0x09f adcon0 equ 0x1f adresh equ 0x1e pir1 equ 0x0c #define rp0 status,5 #define rp1 status,6 #define z status;2 #define adif pir1,6 #define godon adcon0,2 #define c status,0 org 0x00 goto inicio org 0x04 inicio bcf rp1 bsf rp0,cambio de banco clrf trisb movlw 0x00 movwf trisc movlw ob00000000 movwf trisd movlw ob11111111 movwf trisa clrf trise bcf rp1 convertir movlw ob00000001 movwf adcon0 bcf godone no_1 btfss adif goto no_1 movf adresh movwf portb clrf adresh movlw ob00001001 movwf adcon0 bsf godone no_2 btfss adif goto no_2 movf adresh movwf portc
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  • 1. list p=16f877A ; list directive to define processor #include <p16f877A.inc> ; processor specific variable definitions __CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _XT_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF |status equ 0x03 w equ 0x00 trisa equ 0x05 trisb equ 0x06 trisc equ 0x07 trisd equ 0x08 trise equ 0x09 porta equ 0x85 portb equ 0x86 adcon1 equ 0x09f adcon0 equ 0x1f adresh equ 0x1e pir1 equ 0x0c #define rp0 status,5 #define rp1 status,6 #define z status;2 #define adif pir1,6 #define godon adcon0,2 #define c status,0 org 0x00 goto inicio org 0x04 inicio bcf rp1 bsf rp0,cambio de banco clrf trisb movlw 0x00 movwf trisc movlw ob00000000 movwf trisd movlw ob11111111 movwf trisa clrf trise bcf rp1 convertir movlw ob00000001 movwf adcon0 bcf godone no_1 btfss adif goto no_1 movf adresh movwf portb clrf adresh movlw ob00001001 movwf adcon0 bsf godone no_2 btfss adif goto no_2 movf adresh movwf portc