C8051F989-GUR Silicon Labs, C8051F989-GUR Datasheet - Page 81
C8051F989-GUR
Manufacturer Part Number
C8051F989-GUR
Description
8-bit Microcontrollers - MCU 4kB 512B RAM
Manufacturer
Silicon Labs
Datasheet
1.C8051F986-GUR.pdf
(322 pages)
Specifications of C8051F989-GUR
Rohs
yes
Core
8051
Data Bus Width
8 bit
Processor Series
C8051
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5.7.
ADC0 on C8051F99x-C8051F98x has an analog multiplexer, referred to as AMUX0.
AMUX0 selects the positive inputs to the single-ended ADC0. Any of the following may be selected as the
positive input: Port I/O pins, the on-chip temperature sensor, Regulated Digital Supply Voltage (Output of
VREG0), VDD Supply, or the positive input may be connected to GND. The ADC0 input channels are
selected in the ADC0MX register described in SFR Definition 5.12.
Important Note About ADC0 Input Configuration: Port pins selected as ADC0 inputs should be
configured as analog inputs, and should be skipped by the Digital Crossbar. To configure a Port pin for
analog input, set to 0 the corresponding bit in register PnMDIN and disable the digital driver (PnMDOUT =
0 and Port Latch = 1). To force the Crossbar to skip a Port pin, set to 1 the corresponding bit in register
PnSKIP. See Section “21. Port Input/Output” on page 213 for more Port I/O configuration details.
ADC0 Analog Multiplexer
*Only available on
24-pin devices.
Sensor
Temp
*P1.4
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
P1.2
P1.3
Digital Supply
VDD
Figure 5.7. ADC0 Multiplexer Block Diagram
ADC0MX
AMUX
Rev. 1.1
C8051F99x-C8051F98x
Gain = 0.5 or 1
Programmable
Attenuator
AIN+
ADC0
81
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