C8051F388-B Datasheet, PDF (67/285 Pages) Silicon Laboratories – Flash MCU Family

C8051F388/9/A/B
8.1. Comparator Multiplexers
C8051F388/9/A/B devices include an analog input multiplexer to connect Port I/O pins to the comparator
inputs. The Comparator inputs are selected in the CPTnMX registers (SFR Definition 8.5 and SFR Defini-
tion 8.6). The CMXnP2–CMXnP0 bits select the Comparator positive input; the CMXnN2–CMXnN0 bits
select the Comparator negative input.
Important Note About Comparator Inputs: The Port pins selected as comparator inputs should be con-
figured as analog inputs in their associated Port configuration register, and configured to be skipped by the
Crossbar (for details on Port configuration, see Section “20.3. General Purpose Port I/O” on page 155).
Figure 8.4. Comparator Input Multiplexer Block Diagram
Rev. 1.1
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