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2.11 CRC Calculation Circuit
2.11.1 Overview
Cyclic Redundancy Check (CRC) is a method that compares CRC code formed from transmission data
by use of a polynomial generation with CRC check data so as to detect errors in transmission data. Using
the CRC calculation circuit allows generation of CRC code. The microcomputer uses a generator polyno-
mial of CRC_CCITT (X
And, the CRC circuit includes the ability to snoop reads and writes to SFR addresses. This can be used
to accumulate the CRC value on a stream of data without using extra bandwidth to explicitly write data
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into the CRCIN register.
(1) Registers related to CRC calculation circuit
Figure 2.11.1 shows the memory map of CRC-related registers, and Figure 2.11.2 shows CRC- re-
lated registers.
Figure 2.11.1. Memory map of CRC-related registers
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
16
12
5
+ X
+ X
+ 1) or CRC-16 (X
03B4
16
CRC snoop address register CRCSAR
03B5
16
03B6
16
CRC mode register CRCMR
03BC
16
CRC data register CRCD
03BD
16
03BE
CRC input register CRCIN
16
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2. CRC Calculation Circuit
16
15
2
+ X
+ X
+ 1) to generte CRC code.
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