K60P100M100SF2RM Datasheet, PDF (756/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Memory map and register descriptions
CRC_CRC field descriptions (continued)
Field
23–16
HL
15–8
LU
7–0
LL
CRC High Lower Byte
Description
In 16-bit CRC mode (the CTRL[TCRC] bit is 0), this field is not used for programming a seed value. In 32-
bit CRC mode (the CTRL[TCRC] bit is 1), values written to this field are part of the seed value when the
CTRL[WAS] bit is 1. When the CTRL[WAS] bit is 0, data written to this field is used for CRC checksum
generation in both 16-bit and 32-bit CRC modes.
CRC Low Upper Byte
When the CTRL[WAS] bit is 1, values written to this field are part of the seed value. When the
CTRL[WAS] bit is 0, data written to this field is used for CRC checksum generation.
CRC Low Lower Byte
When the CTRL[WAS] bit is 1, values written to this field are part of the seed value. When the
CTRL[WAS] bit is 0, data written to this field is used for CRC checksum generation.
31.2.2 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: CRC_GPOLY is 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
W
LOW
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
31–16
HIGH
15–0
LOW
High polynominal half-word
Description
This field is writable and readable in 32-bit CRC mode (the CTRL[TCRC] bit is 1). This field is not writable
in 16-bit CRC mode (the CTRL[TCRC] bit is 0).
Low polynominal half-word
This field is writable and readable in both 32-bit and 16-bit CRC modes.
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
756
Freescale Semiconductor, Inc.