XC886/888CLM
Analog-to-Digital Converter
User’s Manual
16-8
V1.3, 2010-02
ADC, V 1.0
16.4
Functional Description
The ADC module functionality includes:
•
Two different conversion request sources (sequential and parallel) with independent
registers. The request sources are used to trigger conversions due to external events
(synchronization to PWM signals), sequencing schemes, etc.
•
An arbiter that regularly scans the request sources to find the channel with the
highest priority for the next conversion. The priority of each source can be
programmed individually to obtain the required flexibility to cover the desired range
of applications.
•
Control registers for each of the eight channels that define the behavior of each
analog input (such as the interrupt behavior, a pointer to a result register, a pointer to
a channel class, etc.).
•
An input class register that delivers general channel control information (sample
time) from a centralized location.
•
Four result registers (instead of one result register per analog input channel) for
storing the conversion results and controlling the data reduction.
•
A decimation stage for conversion results, adding the incoming result to the value
already stored in the targeted result register. This stage allows fast consecutive
conversions without the risk of data loss for slow CPU clock frequency.
Figure 16-4
ADC Block Diagram
analog input 7
analog
part
. .
.
arbiter
data
reduction
channel control 0
channel control 7
input class 0
sequential request source 0
(arbitration slot 0)
result register 0
result register 3
. . .
. .
.
analog input 0
parallel request source 1
(arbitration slot 1)
*
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