HTMS8301FUGSLASHAM datasheet(32/44 Pages) NXP

32 / 44 page

184430

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Product data sheet

PUBLIC

Rev. 3.0 — 18 March 2010

184430

32 of 44

NXP Semiconductors

HITAG µ

ISO 18000 transponder IC

15. Data integrity/calculation of CRC

The following explanations show the features of the HITAG µ protocol to protect read and

write access to transponders from undetected errors. The CRC is an 16-bit CRC

according to ISO 11784/11785.

15.1 Data transmission: RWD to HITAG µ ISO 18000 transponder IC

Data stream transmitted by the RWD to the HITAG µ ISO 18000 transponder may include

an optional 16-bit Cyclic Redundancy Check (CRC-16).

The data stream is first verified for data errors by the HITAG µ ISO 18000 transponder IC

and then executed.

The generator polynomial for the CRC-16 is:

u16 + u12 + u5+ 1 = 1021h

The CRC pre set value is: 0000h

15.2 Data transmission: HITAG µ ISO 18000 transponder IC to RWD

The HITAG µ ISO 18000 transponder IC calculates the CRC on all received bits of the

request. Whether the HITAG µ ISO 18000 transponder IC calculated CRC is appended to

the response depends on the setting of the CRCT flag.

HTMS8301FUG/AM Datasheet(PDF) 32 Page - NXP Semiconductors