CRC_CRC field descriptions (continued)
Field
Description
23–16
HL
CRC High Lower Byte
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.
15–8
LU
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.
7–0
LL
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
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
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).
15–0
LOW
Low polynominal half-word
This field is writable and readable in both 32-bit and 16-bit CRC modes.
Memory map and register descriptions
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
766
Freescale Semiconductor, Inc.
Содержание K53 Series
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