m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 258

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
2.11 CRC Calculation Circuit
Figure 2.11.1. Memory map of CRC-related registers
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
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.
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03BC
03BD
03BE
03B4
03B5
03B6
16
16
16
16
16
16
16
+ X
CRC snoop address register CRCSAR
CRC mode register CRCMR
CRC data register CRCD
CRC input register CRCIN
12
+ X
5
+ 1) or CRC-16 (X
16
+ X
15
+ X
2
+ 1) to generte CRC code.
2. CRC Calculation Circuit