Figure 16.48 Lsb-First Data Reception - Renesas H8S/2158 User Manual

Section 16 Serial Communication Interface (SCI, IrDA, and CRC)
1. Serial reception (LSB first)
7
1 1 1 1 0
F
2. Write H'83 to CRCCR
7
CRCCR
1 0
7
0 0
CRCDORH
CRCDORL
0 0
4. Write H'8F to CRCDIR
7
CRCDIR 1 0
7
0 0
CRCDORH
CRCDORL
1 1
6. Read from CRCDOR
CRC code = H'0000 → No error
Rev. 3.00 Jan 25, 2006 page 470 of 872
REJ09B0286-0300
CRC code
0
7
1 1 1 1 0 0 0
7 8
0
0 0 0 0 1 1
CRCDOR clearing
0
0 0 0 0 0 0
0 0 0 0 0 0
0
0 0 1 1 1 1
CRC code generation
0
0 0 0 0 0 0
1 1 0 1 1 1

Figure 16.48 LSB-First Data Reception

0
7
1 1 1 1 1 1
1
F F
3. Write H'F0 to CRCDIR
7
CRCDIR
1 1
7
1 1
CRCDORH
CRCDORL
1 0
5. Write H'F7 to CRCDIR
7
CRCDIR 1 1
7
0 0
CRCDORH
CRCDORL
0 0
Data
0
1 0 0 0
0
0
0
1 1 0 0 0 0
CRC code generation
0
1 1 0 1 1
1
0 0 1 1 1 1
0
1 1 0 1 1
1
CRC code generation
0
0 0 0 0 0 0
0 0 0 0 0
0
Input