C8051F572-IMR Silicon Labs, C8051F572-IMR Datasheet - Page 76
C8051F572-IMR
Manufacturer Part Number
C8051F572-IMR
Description
8-bit Microcontrollers - MCU 50 MIPS 16 kB 2 kB CAN2.0 LIN 2.1 SPI
Manufacturer
Silicon Labs
Datasheet
1.C8051F556-IMR.pdf
(302 pages)
Specifications of C8051F572-IMR
Rohs
yes
Core
8051
Data Bus Width
8 bit
Processor Series
C8051
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C8051F55x/56x/57x
8.1. Comparator Multiplexer
C8051F55x/56x/57x devices include an analog input multiplexer for each of the comparators to connect
Port I/O pins to the comparator inputs. The Comparator0 inputs are selected in the CPT0MX register (SFR
Definition 8.5). The CMX0P3 – CMX0P0 bits select the Comparator0 positive input; the CMX0N3 – CMX0N0
bits select the Comparator0 negative input. Similarly, the Comparator1 inputs are selected in the CPT1MX
register using the CMX1P3-CMX1P0 bits and CMX1N3-CMX1N0 bits. The same pins are available to both
multiplexers at the same time and can be used by both comparators simultaneously.
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 “19.6. Special Function Registers for Accessing
and Configuring Port I/O” on page 181).
76
P0.1
P0.3
P0.5
P0.7
P1.1
P1.3
P1.5
P1.7
P2.1
P2.3
P2.5
P2.7
CMXnN3
CMXnN2
CMXnN1
CMXnN0
CMXnP3
CMXnP2
CMXnP1
CMXnP0
Figure 8.3. Comparator Input Multiplexer Block Diagram
P0.0
P0.2
P0.4
P0.6
P1.0
P1.2
P1.4
P1.6
P2.0
P2.2
P2.4
P2.6
Rev. 1.1
CPn +
CPn -
+
-
VDD
GND
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