Section 14 CRC Operation Circuit (CRC)
Rev. 1.00 Mar. 12, 2008 Page 498 of 1178
REJ09B0403-0100
14.2 Register
Descriptions
The CRC operation circuit has the following registers.
•
CRC control register (CRCCR)
•
CRC data input register (CRCDIR)
•
CRC data output register (CRCDOR)
14.2.1
CRC Control Register (CRCCR)
CRCCR initializes the CRC operation circuit, switches the operation mode, and selects the
generating polynomial.
Bit
Bit Name
Initial
Value
R/W Description
7 DORCLR
0 W CRCDOR
Clear
Setting this bit to 1 clears CRCDOR to H
′
0000.
6 to 3
All
0
R
Reserved
The initial value should not be changed.
2
LMS
0
R/W
CRC Operation Switch
Selects CRC code generation for LSB-first or MSB-first
communication.
0: Performs CRC operation for LSB-first communication.
The lower byte (bits 7 to 0) is first transmitted when
CRCDOR contents (CRC code) are divided into two
bytes to be transmitted in two parts.
1: Performs CRC operation for MSB-first communication.
The upper byte (bits 15 to 8) is first transmitted when
CRCDOR contents (CRC code) are divided into two
bytes to be transmitted in two parts.
1
0
G1
G0
0
0
R/W
R/W
CRC Generating Polynomial Select
These bits select the polynomial.
00: Reserved
01: X
8
+ X
2
+ X + 1
10: X
16
+ X
15
+ X
2
+ 1
11: X
16
+ X
12
+ X
5
+ 1
Содержание H8S Family
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