ST20CX 查看數據表（PDF） - STMicroelectronics
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ST20CX Datasheet PDF : 212 Pages
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crcword
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) + AregBitsPerWord-i)
⊗ (Creg × temp(i −1)BitsPerWord-1)
Error signals: none
Comments:
Secondary instruction.
See also: crcbyte
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