Figure 16.49 Msb-First Data Reception - Renesas H8S/2158 User Manual

1. Serial reception (MSB first)
7
Input
1 1
F
2. Write H'83 to CRCCR
7
CRCCR
1 0 0
7
0 0 0
CRCDORH
CRCDORL
0 0 0
4. Write H'EF to CRCDIR
7
CRCDIR 1 1 1
7
0 0 0
CRCDORH
CRCDORL
0 0 0
6. Read from CRCDOR
CRC code = H'0000 → No error
Section 16 Serial Communication Interface (SCI, IrDA, and CRC)
Data
0
7
1 1 0 0 0 0 1
0
0
0 0 1 1 1
CRCDOR clearing
0
0 0 0 0 0
0 0 0 0 0
0
0 1 1 1 1
CRC code generation
0
1 1 1 1 1
0 0 0 0 0

Figure 16.49 MSB-First Data Reception

CRC code
0
1 1 0 1 1 1 1
E F
3. Write H'F0 to CRCDIR
7
CRCDIR
1 1
7
1 1
CRCDORH
CRCDORL
0 0
5. Write H'1F to CRCDIR
7
CRCDIR 0 0
7
0 0
CRCDORH
CRCDORL
0 0
Rev. 3.00 Jan 25, 2006 page 471 of 872
7
0 0 0 1 1 1 1
1 F
0
1 1 0 0 0 0
CRC code generation
0
1 0 1 1 1
1
0 1 1 1 1 1
0
0 1 1 1 1
1
CRC code generation
0
0 0 0 0 0 0
0 0 0 0 0
0
REJ09B0286-0300
0
1