Datasheet

651
11011B–ATARM–21-Feb-12
SAM3N
651
11011B–ATARM–21-Feb-12
SAM3N
33.5 Product Dependencies
33.5.1 Power Management
The ADC Controller is not continuously clocked. The programmer must first enable the ADC
Controller MCK in the Power Management Controller (PMC) before using the ADC Controller.
However, if the application does not require ADC operations, the ADC Controller clock can be
stopped when not needed and restarted when necessary. Configuring the ADC Controller does
not require the ADC Controller clock to be enabled.
33.5.2 Interrupt Sources
The ADC interrupt line is connected on one of the internal sources of the Interrupt Controller.
Using the ADC interrupt requires the NVIC to be programmed first.
33.5.3 Analog Inputs
The analog input pins can be multiplexed with PIO lines. In this case, the assignment of the ADC
input is automatically done as soon as the corresponding channel is enabled by writing the reg-
ister ADC_CHER. By default, after reset, the PIO line is configured as input with its pull-up
enabled and the ADC input is connected to the GND.
33.5.4 I/O Lines
The pin ADTRG may be shared with other peripheral functions through the PIO Controller. In
this case, the PIO Controller should be set accordingly to assign the pin ADTRG to the ADC
function.
Table 33-2. Peripheral IDs
Instance ID
ADC 29
Table 33-3. I/O Lines
Instance Signal I/O Line Peripheral
ADC ADTRG PA8 B
ADC AD0 PA17 X1
ADC AD1 PA18 X1
ADC AD2/WKUP9 PA19 X1
ADC AD3/WKUP10 PA20 X1
ADC AD4 PB0 X1
ADC AD5 PB1 X1
ADC AD6/WKUP12 PB2 X1
ADC AD7 PB3 X1
ADC AD8 PA21 X1
ADC AD9 PA22 X1
ADC AD10 PC13 X1
ADC AD11 PC15 X1
ADC AD12 PC12 X1