NXP Semiconductors K22F series, Reference Manual, Page: 744 / 1407

32.2.2 CRC Polynomial register (CRC_GPOLY)
This register contains the value of the polynomial for the CRC calculation. The HIGH
field contains the upper 16 bits of the CRC polynomial, which are used only in 32-bit
CRC mode. Writes to the HIGH field are ignored in 16-bit CRC mode. The LOW field
contains the lower 16 bits of the CRC polynomial, which are used in both 16- and 32-bit
CRC modes.
Address: 4003_2000h base + 4h offset = 4003_2004h
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
HIGH LOW
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 1
CRC_GPOLY field descriptions
Field Description
31–16
HIGH
High Polynominal Half-word
Writable and readable in 32-bit CRC mode (CTRL[TCRC] is 1). This field is not writable in 16-bit CRC
mode (CTRL[TCRC] is 0).
LOW Low Polynominal Half-word
Writable and readable in both 32-bit and 16-bit CRC modes.
32.2.3 CRC Control register (CRC_CTRL)
This register controls the configuration and working of the CRC module. Appropriate bits
must be set before starting a new CRC calculation. A new CRC calculation is initialized
by asserting CTRL[WAS] and then writing the seed into the CRC data register.
Address: 4003_2000h base + 8h offset = 4003_2008h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
R
TOT TOTR
0
FXOR WAS
TCRC
0
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Bit
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
0
W
Reset
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Memory map and register descriptions
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
744 NXP Semiconductors