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H8SX/1663 数据表(PDF) 799 Page - Renesas Technology Corp

部件名 H8SX/1663
功能描述  Renesas 32-Bit CISC Microcomputer H8SX Family / H8SX/1600 Series
PDF  1158 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

H8SX/1663 数据表(HTML) 799 Page - Renesas Technology Corp

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Section 15 Serial Communication Interface (SCI, IrDA, CRC)
Rev.1.00 Jun. 07, 2006 Page 747 of 1102
REJ09B0294-0100
15.11.3
CRC Operation Circuit Operation
The CRC operation circuit generates a CRC code for LSB-first/MSB-first communications. An
example in which a CRC code for hexadecimal data H'F0 is generated using the X
16 + X12 + X5 + 1
polynomial with the G1 and G0 bits in CRCCR set to B'11 is shown below.
CRCCR
CRCDORH
CRCDORL
CRCDOR clearing
1. Write H'83 to CRCCR
1
7
0
0
0
00
0
7
0
7
0
7
0
1
1
0
0
0
0
0
00
0
0
0
0
0
0
00
0
CRCDIR
CRCDORH
CRCDORL
CRC code generation
2. Write H'F0 to CRCDIR
1
1
1
1
0
00
0
1
1
1
1
0
11
1
1
0
0
0
1
11
1
CRC code = H'F78F
CRC code
Output
Data
3. Read from CRCDOR
7
7
7
FF
F
0
8
7
00
0
4. Serial transmission (LSB first)
1
1
1
1
0
1
1
1
1
0
0
0
1
11
1
1
1
1
1
0
00
0
Figure 15.44 LSB-First Data Transmission
CRCCR
CRCDORH
CRCDORL
CRCDOR clearing
1. Write H'87 to CRCCR
1
7
0
0
0
01
0
7
0
7
0
7
0
1
1
0
0
0
0
0
00
0
0
0
0
0
0
00
0
CRCDIR
CRCDORH
CRCDORL
CRC code generation
2. Write H'F0 to CRCDIR
1
1
1
1
0
00
0
1
1
1
0
1
11
1
0
0
0
1
1
11
1
CRC code = H'EF1F
CRC code
Output
Data
3. Read from CRCDOR
7
7
0
FF
1
F
E
7
00
0
4. Serial transmission (MSB first)
1
1
1
1
0
0
0
0
1
1
1
0
1
11
1
0
0
0
1
1
11
1
Figure 15.45 MSB-First Data Transmission



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