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ST20CX Folha de dados(PDF) 56 Page - STMicroelectronics

Nome de Peças ST20CX
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

ST20CX Folha de dados(HTML) 56 Page - STMicroelectronics

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crcbyte
®
56/212
crcbyte
calculate CRC on byte
Code: 27 F5
Description: Generate a CRC (cyclic redundancy check) checksum from the most
significant b yte of 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 (8 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(8)
Breg
′← Creg
Creg
′← undefined
where
temp(0)
= Breg
for i
= 1.. 8
temp(i)
= (temp(i -1) << 1) + Areg
BitsPerWord-i)
⊗ (Creg × temp(i −1)
BitsPerWord-1)
Error signals: none
Comments:
Secondar y instruction.
See also:
crcword



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