SAM7X256_14 Datasheet, PDF (464/662 Pages) ATMEL Corporation – ARM-based Flash MCU

35.3 Signal Description
Table 35-1.
Pin Name
ADVREF
AD0 - AD7
ADTRG
ADC Pin Description
Description
Reference voltage
Analog input channels
External trigger
35.4 Product Dependencies
35.4.1 Power Management
The ADC Controller clock (MCK) is always clocked.
35.4.2 Interrupt Sources
The ADC interrupt line is connected on one of the internal sources of the Advanced Interrupt Controller. Using the ADC
interrupt requires the AIC to be programmed first.
35.4.3 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 register 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.
35.4.4 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.
35.4.5 Timer Triggers
Timer Counters may or may not be used as hardware triggers depending on user requirements. Thus, some or all of the
timer counters may be non-connected.
35.4.6 Conversion Performances
For performance and electrical characteristics of the ADC, see the DC Characteristics section.
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
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