M30620FCAFP datasheet(469/615 Pages) RENESAS

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CRC Calculation Circuit

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-152

2.10.1 Overview of the CRC calculation circuit usage

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. A polynomial counter is used for the polyno-

mial generation of CRC_CCITT (X16 + X12 + X5 + 1).

(1) Registers related to CRC calculation circuit

Figure 2.10.1 shows the memory map of CRC-related registers, and Figure 2.10.2 shows CRC- re-

lated registers.

2.10 CRC Calculation Circuit Usage

Figure 2.10.1. Memory map of CRC-related registers

03BC16

03BD16

03BE16

CRC data register (CRCD)

CRC input register (CRCIN)

Figure 2.10.2. CRC-related registers

Symbol

Address

When reset

CRCD

03BD16, 03BC16

Indeterminate

b0 b7

(b15)

(b8)

CRC data register

CRC calculation result output register

Function

Values that

can be set

000016 to FFFF16

Symbo

Address

When reset

CRCIN

03BE16

Indeterminate

CRC input register

Data input register

Function

Values that

can be set

0016 to FF16

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