Section 16 Serial Communication Interface (SCI, IrDA, and CRC)
Rev. 3.00 Jan 25, 2006 page 469 of 872
REJ09B0286-0300
16.11.3 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
+ X
12
+ X
5
+
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
0
0
0
7
0
7
0
7
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
CRCDIR
CRCDORH
CRCDORL
CRC code generation
2. Write H'F0 to CRCDIR
1
1
1
1
0
0
0
0
1
1
1
1
0
1
1
1
1
0
0
0
1
1
1
1
CRC code = H'F78F
CRC code
Output
Data
3. Read from CRCDOR
7
7
7
F
F
F
0
8
7
0
0
0
4. Serial transmission (LSB first)
1
1
1
1
0
1
1
1
1
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
Figure 16.46 LSB-First Data Transmission
CRCCR
CRCDORH
CRCDORL
CRCDOR clearing
1. Write H'87 to CRCCR
1
7
0
0
0
0
1
0
7
0
7
0
7
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
CRCDIR
CRCDORH
CRCDORL
CRC code generation
2. Write H'F0 to CRCDIR
1
1
1
1
0
0
0
0
1
1
1
0
1
1
1
1
0
0
0
1
1
1
1
1
CRC code = H'EF1F
CRC code
Output
Data
3. Read from CRCDOR
7
7
0
F
F
1
F
E
7
0
0
0
4. Serial transmission (MSB first)
1
1
1
1
0
0
0
0
1
1
1
0
1
1
1
1
0
0
0
1
1
1
1
1
Figure 16.47 MSB-First Data Transmission
Содержание H8S/2158
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Страница 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
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Страница 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Страница 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Страница 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Страница 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Страница 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Страница 744: ...Section 20 Encryption Operation Circuit DES and GF Rev 3 00 Jan 25 2006 page 690 of 872 REJ09B0286 0300...
Страница 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Страница 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Страница 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Страница 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Страница 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Страница 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...