M30622MA-XXXFP RENESAS [Renesas Technology Corp], M30622MA-XXXFP Datasheet - Page 439

• Manufacturer Part Number: M30622MA-XXXFP
• Description: 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY
• Manufacturer: RENESAS [Renesas Technology Corp]

CRC Calculation Circuit
424
2.10 CRC Calculation Circuit
Figure 2.10.1. Memory map of CRC-related registers
Figure 2.10.2. CRC-related registers
2.10.1 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. A polynomial counter is used for the polyno-
mial generation of CRC_CCITT (X
(b15)
CRC data register
b7
b7
(1) Registers related to CRC calculation circuit
CRC input register
Figure 2.10.1 shows the memory map of CRC-related registers, and Figure 2.10.2 shows CRC- re-
lated registers.
(b8)
b0 b7
b0
03BC
03BD
03BE
CRC calculation result output register
Data input register
16
16
16
16
CRC data register (CRCD)
CRC input register (CRCIN)
b0
+ X
12
Symbol
CRCD
Symbo
CRCIN
Function
Function
+ X
5
+ 1).
03BD
Address
Address
16
03BE
, 03BC
16
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
16
0000
Values that
Values that
can be set
Indeterminate
00
Indeterminate
can be set
When reset
When reset
16
16
to FFFF
to FF
16
16
Mitsubishi microcomputers
M16C / 62 Group
R
R
W
W