RF430CL331HIPWR datasheet(41/60 Pages) TI1

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RF430CL331H

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SLASE18A – SEPTEMBER 2015 – REVISED NOVEMBER 2015

5.11.4 CRC Registers

Writing the CRC address and the CRC length registers initiates a 16-bit CRC calculation of the specified

address range. The length is always assumed to be even (16-bit aligned). Writing the length register starts

the CRC calculation.

During the CRC calculation, the CRC active bit is set (= 1). When the calculation is complete, the CRC

completion interrupt flag is set and the result of the CRC calculation can be read from the CRC result

= 0).

Table 5-19. CRC Result Register

ADDRESS

0xFFF7

CRC CCITT Result (high byte)

ADDRESS

0xFFF6

CRC CCITT Result (low byte)

Table 5-20. CRC Result Register Description

BIT

FIELD

TYPE

RESET

DESCRIPTION

15-0

CRC-CCITT Result

Table 5-21. CRC Length Register

ADDRESS

0xFFF5

CRC Length (high byte)

ADDRESS

0xFFF4

CRC Length (low byte)

Table 5-22. CRC Length Register Description

BIT

FIELD

TYPE

RESET

DESCRIPTION

CRC Length. Always assumed to be even (Bit 0 = 0). Writing into high byte

15-0

CRC Length

starts CRC calculation.

Table 5-23. CRC Start Address Register

ADDRESS

0xFFF3

CRC Start Address (high byte)

ADDRESS

0xFFF2

CRC Start Address (low byte)

Table 5-24. CRC Start Address Register Description

BIT

FIELD

TYPE

RESET

DESCRIPTION

CRC Start Address. Defines start address within NDEF memory. This address

15-0

CRC Start Address

is always assumed to be even (bit 0 = 0).

The CRC is calculated based on the CCITT polynomial initialized with 0xFFFF.

CCITT polynomial: x16 + x12 + x5 + 1

Detailed Description

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