M306H7MG-XXXFP Datasheet, PDF (189/329 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with DATA ACQUISITION CONTROLLER

M306H7MG-XXXFP/MC-XXXFP/FGFP
14. EXPANSION FUNCTION
(1) Reset of CRC
remainder bit
b81
b0
0 0 0 0 0 0 0 • • • 0 0 0 0 0 0 0 0 ^{CRC register}
CRC_81 to 00
[address 0216 to 0716]
CRC remainder bit is automatically reset by CRCON=0 (address control register for CRC registers).
(2) Setting 0016
b15
b0
CRC register
DAOUT
[address 0016]
After CRC operation end
b81
b0
CRC register
CRC_81 to 00
[address 0216 to 0716]
The CRC code is stored
The data set as the DAOUT register is shifted from the low rank side of CRC remainder bit one by one (b0).
MOJURO-2 operation is
operation that complies
with the law given below.
0+0=0
0+1=1
1+0=1
1+1=0
-1 = 1
100 0011 0000 • • • 0001 0001
b82 b81
b0
1000 01 • • •
0000 0000 0000 0001 0000 0000 • • • 0000 0000 0000 • • • 0000 0000
1 0000 1100 • • • 0010 001
1100 • • • 0010 0010 0000
1000 • • • 0001 0001
Figure 14.7
Remainder
Generator polynomial shown in below is used in this circuit :
b81
b0
X82 + X77 + X76 + X71 + X67 + X66 + X52 + X48 + X40 + X36 + X34 + X24 + X22 + X18 + X10 + X4 + 1
Example of operation of CRC operation circuit
Rev.2.10 Oct 25, 2006 Page 189 of 326
REJ03B0152-0210