Bit one GO/~DONE shows the status of A/D conversion.

It is recommended to turn off ADC by setting this bit to zero if you are not using ADC.

Therefore, before using this module, we should turn on this bit by setting ADON=1.

Bit zero ADON starts of stops the ADC.

This configuration will select analog channel zero or AN0 to get an analog signal from. For example, if we set these four bits to zero: We configure these four bits ( from bit 2-5) to select a specific channel.

Firstly, it selects the analog input channel from CH0-CH15 with the help of CHS3: CHS0 bits.

ADCON0 has 8 bits and 2 bits (bit 6-7) have no connection or unused. The ADCON0 register stands for Analog to digital converter control register zero. For further information refer to the ADCON2 register section. Note: ADFM bit of ADCON2 Register determines either the result will be left-justified or right-justified.

ADRESL Register: Similarly, ASREDL holds 8 least significant bits or most significant bits of 10-bit digital number that is an output of A/D converter or SAR.

Therefore, it stores 2 higher/lower bits of 10-bit digital number depending on how we justified the result storage rule.

ADRESH Register: This register stores higher or lower bits of digital conversion result after the A/D converter produces a 10-bit digital number.

The A/D conversion technique uses a successive approximation (SAR) technique. This digital value is equivalent to its analog input signal. After that, a digital converter changes analog value into a 10-bit digital value. The output of charge/hold capacitor feds to an input of the digital converter. Firstly, each channel accepts analog inputs which charges charge and hold capacitor. How PIC18F ADC Works?ĪDC mainly consists of charge/hold capacitor and successive approximation converter.

However, control and configurations registers are the same for every PIC18F series microcontrollers. But the actual number of channels depends on the microcontroller, you are using. In other words, it can have up to sixteen ADC channels. Each microcontroller can accept up to 16 analog inputs. PIC18F4550 Microcontroller ADC Value On Interruptįirstly, all PIC18F series has a built-in 10-bit ADC module.Interfacing POT and LCD with PIC Microcontroller.PIC18F4550 Microcontroller ADC Programming.ADC Acquisition Time PIC Microcontroller.

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