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ST20C2 Folha de dados(PDF) 57 Page - STMicroelectronics

Nome de Peças ST20C2
Descrição Electrónicos  Instruction Set Reference Manual
PDF  212 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST20C2 Folha de dados(HTML) 57 Page - STMicroelectronics

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crcword
57/212
®
crcword
calculate CRC on word
Code: 27 F4
Description: Generate a CRC (cyclic redundancy check) checksum from Areg. Breg
contains the previously accumulated checksum and Creg the polynomial divisor (or
‘generator’). The new CRC checksum, the polynomial remainder, is calculated by
repeatedly (BitsPerWord times) shifting the accumulated checksum left, shifting in
successive bits from the Areg and if the bit shifted out of the checksum was a 1, then
the generator is exclusive-ored into the checksum.
Definition:
Areg
′← temp(BitsPerWord)
Breg
′← Creg
Creg
′← undefined
where
temp(0)
= Breg
for i
= 1.. 32
temp(i)
= (temp(i -1) << 1) + Areg
BitsPerWord-i)
⊗ (Creg × temp(i −1)
BitsPerWord-1)
Error signals: none
Comments:
Secondary instruction.
See also:
crcbyte



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