Datasheet

652
11011B–ATARM–21-Feb-12
SAM3N
652
11011B–ATARM–21-Feb-12
SAM3N
33.5.5 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 unconnected.
33.5.6 Conversion Performances
For performance and electrical characteristics of the ADC, see the product DC Characteristics
section.
33.6 Functional Description
33.6.1 Analog-to-digital Conversion
The ADC uses the ADC Clock to perform conversions. Converting a single analog value to a 10-
bit digital data requires Tracking Clock cycles as defined in the field TRACKTIM of the “ADC
Mode Register” on page 661 and Transfer Clock cycles as defined in the field TRANSFER of the
same register. The ADC Clock frequency is selected in the PRESCAL field of the Mode Register
(ADC_MR). The tracking phase starts during the conversion of the previous channel. If the track-
ing time is longer than the conversion time, the tracking phase is extended to the end of the
previous conversion.
The ADC clock range is between MCK/2, if PRESCAL is 0, and MCK/512, if PRESCAL is set to
255 (0xFF). PRESCAL must be programmed in order to provide an ADC clock frequency
according to the parameters given in the product Electrical Characteristics section.
ADC AD13 PC29 X1
ADC AD14 PC30 X1
ADC AD15 PC31 X1
Table 33-3. I/O Lines