In some packages, V
REFH
is connected in the package to V
DDA
and V
REFL
to V
SSA
. If
externally available, the positive reference(s) may be connected to the same potential as
V
DDA
or may be driven by an external source to a level between the minimum Ref
Voltage High and the V
DDA
potential (V
REFH
must never exceed V
DDA
). Connect the
ground references to the same voltage potential as V
SSA
.
34.2.4 Analog channel inputs (ADx)
The ADC module supports up to 24 single-ended analog inputs. A single-ended input is
selected for conversion through the ADCH channel select bits when the DIFF bit in the
SC1n register is low.
34.2.5 Differential analog channel inputs (DADx)
The ADC module supports up to 4 differential analog channel inputs. Each differential
analog input is a pair of external pins (DADPx and DADMx) referenced to each other to
provide the most accurate analog to digital readings. A differential input is selected for
conversion through the ADCH channel select bits when the DIFF bit in the SC1n register
bit is high. All DADPx inputs may be used as single-ended inputs if the DIFF bit is low.
In certain MCU configurations, some DADMx inputs may also be used as single-ended
inputs if the DIFF bit is low. Refer to the Chip Configuration chapter for ADC
connections specific to this MCU.
34.3 Register Definition
This section describes the ADC registers.
ADC memory map
Absolute
address
(hex)
Register name
Width
(in bits)
Access Reset value
Section/
page
4003_B000
ADC status and control registers 1 (ADC0_SC1A)
32
R/W
0000_001Fh
4003_B004
ADC status and control registers 1 (ADC0_SC1B)
32
R/W
0000_001Fh
4003_B008
ADC configuration register 1 (ADC0_CFG1)
32
R/W
0000_0000h
Table continues on the next page...
Chapter 34 Analog-to-Digital Converter (ADC)
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
813
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