33.3.8 ADC Offset Correction Register (ADCx_OFS)
The ADC Offset Correction Register (OFS) contains the user-selected or calibration-
generated offset error correction value. This register is a 2’s complement, left-justified,
16-bit value . The value in OFS is subtracted from the conversion and the result is
transferred into the result registers, Rn. If the result is greater than the maximum or less
than the minimum result value, it is forced to the appropriate limit for the current mode of
operation.
Address: Base a 28h offset
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
R
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0
ADCx_OFS field descriptions
Field
Description
31–16
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
15–0
OFS
Offset Error Correction Value
33.3.9 ADC Plus-Side Gain Register (ADCx_PG)
The Plus-Side Gain Register (PG) contains the gain error correction for the plus-side
input in differential mode or the overall conversion in single-ended mode. PG, a 16-bit
real number in binary format, is the gain adjustment factor, with the radix point fixed
between ADPG15 and ADPG14. This register must be written by the user with the value
described in the calibration procedure. Otherwise, the gain error specifications may not
be met.
Address: Base a 2Ch offset
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
R
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
Chapter 33 Analog-to-Digital Converter (ADC)
K22F Sub-Family Reference Manual , Rev. 3, 7/2014
Freescale Semiconductor, Inc.
709
