Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

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The conversion is performed on a full range between 0V and the reference voltage pin ADVREF. Analog inputs 

between these voltages convert to values based on a linear conversion.

The ADC supports 12-bit resolutions.

When a conversion is completed, the resulting 12-bit digital value is stored in the Channel Data Register 

(ADC_CDRx) of the current channel and in the ADC Last Converted Data Register (ADC_LCDR). By setting the 

TAG option in the ADC_EMR, the ADC_LCDR presents the channel number associated to the last converted data 

in the CHNB field.
The channel EOC bit in the Status Register (ADC_SR) is set and the DRDY is set. In the case of a connected PDC 

channel, DRDY rising triggers a data request. In any case, either EOC and DRDY can trigger an interrupt.
Reading one of the Channel Data registers (ADC_CDRx) clears the corresponding EOC bit. Reading the 

ADC_LCDR clears the DRDY bit.

If the ADC_CDR is not read before further incoming data is converted, the corresponding Overrun Error (OVREx) 

flag is set in the Overrun Status Register (ADC_OVER).
Likewise, new data converted when DRDY is high sets the GOVRE bit (General Overrun Error) in ADC_SR. 
The OVREx flag is automatically cleared when ADC_OVER is read, and GOVRE flag is automatically cleared 

when ADC_SR is read.

Read the ADC_CDRx

EOCx

DRDY

Read the ADC_LCDR

CHx

(ADC_CHSR)

(ADC_SR)

(ADC_SR)

Write the ADC_CR
   with START = 1

Write the ADC_CR
   with START = 1