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M16C/5L Group, M16C/56 Group
25. CRC Calculator
25.1
Introduction
The cyclic redundancy check (CRC) calculator detects errors in data blocks. This CRC calculator is
enhanced by an additional feature, the CRC snoop, in order to monitor reads from and writes to a certain
SFR address, and perform CRC calculations automatically on the data read from and data written to the
aforementioned SFR address.
Table 25.1
CRC Calculator Specifications
Item
Generator polynomial
Selectable functions
16
X
+ X
Figure 25.1
CRC Calculator Block Diagram
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
CRC-CCITT (X
•
MSB/LSB selectable
•
CRC snoop
CRCD register
CRC generator
12
5
16
15
2
+ X
+ 1 or X
+ X
+ X
CRCIN register
Specification
16
12
5
+ X
+ X
+ 1) or CRC-16 (X
Data bus
+ 1
Address bus
25. CRC Calculator
16
15
2
+ X
+ X
+ 1)
CRC snoop block
SFR to snoop
= ?
Snoop enabled
Page 642 of 803
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