Specifications

ADC Overview
7-4
7.2 ADC Overview
7.2.1 Autoconversion Sequencer: Principle of Operation
The ADC sequencer consists of two independent 8-state sequencers (SEQ1
and SEQ2) that can also be cascaded together to form one 16-state sequenc-
er (SEQ). The word “state” represents the number of autoconversions that can
be performed with the sequencer. Block diagrams of the single (16-state, cas-
caded) and dual (two 8-state, separated) sequencer modes are shown in
Figure 7–1 and Figure 7–2, respectively.
In both cases, the ADC has the ability to autosequence a series of conver-
sions. For every conversion, any one of the available 16 input channels can
be selected through the analog mux. After conversion, the digital value of the
selected channel is stored in the appropriate result register (RESULTn). (The
first result is stored in RESULT0, the second result in RESULT1, and so on).
It is also possible to sample the same channel multiple times, allowing the user
to perform “over-sampling”, which gives increased resolution over traditional
single sampled conversion results.