Bit 2 : Go_nDone is the A/D conversion status bit.Bit 5 ~ 3 : CH2, CH1 & CH0 are analog channel selection bits which will select a particular channel out of 8.These bits are used in combination with ADCS2 of ADCON1 register. Bit 7 ~ 6 : ADCS1 & ADCS0, A/D Conversion clock selection bits.ADCON0 – A/D Control Register 0 ADCON0 Register – PIC 16F877A The ADC module of PIC 16F877A has 4 registers.ĪDC Block Diagram ADC Module Block Diagram – PIC16F877Aįrom this block diagram you can easily understand the working of ADC channel selection and reference voltage selection. So ADC resolution is 0.00487V, which is the minimum required voltage to change a bit. For the sake of explanation take ADC Lower Reference as 0V and Higher Reference as 5V.

PIC 16F877A microcontroller has 8 ADC inputs and it will convert analog inputs to a corresponding 10 bit digital number. This is done by using Analog to Digital Converters. An Analog to Digital Converter or ADC is a device which converts continuous analog quantity (here : voltage) to corresponding discrete digital values. We need to convert these analog quantities to digital to process it using a digital computer or a microcontroller. For demonstration we will use the commonly available PIC 16F877A microcontroller.Įvery physical quantity found in nature like temperature, humidity, pressure, force is analog.

In this tutorial we will learn, how to use the ADC module of a PIC Microcontroller using MPLAB XC8 compiler.

H and m ad pic