參數(shù)資料
型號: 73M2910L-IG
英文描述: Microcontroller
中文描述: 微控制器
文件頁數(shù): 22/41頁
文件大小: 509K
代理商: 73M2910L-IG
73M2910L
Microcontroller
REGISTER DESCRIPTION
(continued)
22
CRC GENERATION
FIGURE 3: CCITT TYPE
CCITT Type
The CRC check field is generated by the transmitter. The computation starts with the first transmitted bit after
the opening flag and stops at the last data bit prior to the frame check sequence bytes, and excludes inserted
0s. The CRC generating logic is initialized to all ones. The bits are shifted in and operated on by the
generating polynomial, X
16
+ X
12
+ X
5
+ 1. During CRC transmission, the bytes in the CRC generating logic
are inverted and transmitted, high order bit first.
The receiver also initializes its CRC computation logic to all ones after the beginning flag. Its polynomial
generator (also X
16
+ X
12
+ X
5
+ 1) should see the same value as the transmitter’s polynomial generator as
the last data bit is received. Note the receiver’s polynomial generator does not process inserted 0s. After the
bytes are received in the frame check sequence, a remainder of 1111 0000 1011 1000 (X
0
through X
15
,
respectively) should be detected in the receiver’s polynomial generator. If this is not the case, it is assumed
that the preceding frame was in error and an invalid CRC is declared.
SET
COMPUTE
DATA
AND2
CCITT 16 Bit CRC X
16
+ X
12
+ X
5
+ 1
MUX OUT
C
8
C
1
C
2
C
3
C
4
C
5
C
6
C
7
C
8
C
9
C
10
C
11
C
12
C
13
C
14
C
15
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