73m2910l ETC-unknow, 73m2910l Datasheet - Page 23

• Manufacturer Part Number: 73m2910l
• Description: Microcontroller
• Manufacturer: ETC-unknow

CRC 16
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 0s. The bits are shifted in and operated on by the generating
polynomial, X
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
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 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.
RESET (option to set)
COMPUTE
DATA
CRC 16 X
16
16
+ X
16
+ X
AND2
+ X
15
12
+ X
12
+ X
2
+ X
+ 1
C
5
8
5
+ 1. During CRC transmission, the bytes in the CRC generating logic are
C
+ 1) should see the same value as the transmitter’s polynomial generator as
1
C
2
FIGURE 4: CRC 16
C
3
C
4
23
C
5
C
6
C
7
C
8
C
9
C
10
C
11
C
12
C
13
C
Microcontroller
14
C
15
MUX
OUT