參數(shù)資料
型號: M306N0MCT-XXXXFP
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, 20 MHz, MICROCONTROLLER, PQFP100
封裝: PLASTIC, QFP-100
文件頁數(shù): 32/158頁
文件大?。?/td> 3298K
代理商: M306N0MCT-XXXXFP
127
Under
development
Tentative Specifications REV.A
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M30218 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
CRC Calculation Circuit
Figure UC-3. Calculation example using the CRC calculation circuit
b15
b0
(1) Setting 000016
CRC data register
CRCD
[03BD16, 03BC16]
b0
b7
b15
b0
(2) Setting 0116
CRC input register
CRCIN
[03BE16]
2 cycles
After CRC calculation is complete
CRC data register
CRCD
[03BD16, 03BC16]
118916
Stores CRC code
b0
b7
b15
b0
(3) Setting 2316
CRC input register
CRCIN
[03BE16]
After CRC calculation is complete
CRC data register
CRCD
[03BD16, 03BC16]
0A4116
Stores CRC code
The code resulting from sending 0116 in LSB first mode is (1000 0000). Thus the CRC code in the generating polynomial,
(X16 + X12 + X5 + 1), becomes the remainder resulting from dividing (1000 0000) X16 by (1 0001 0000 0010 0001) in
conformity with the modulo-2 operation.
Thus the CRC code becomes (1001 0001 1000 1000). Since the operation is in LSB first mode, the (1001 0001 1000 1000)
corresponds to 118916 in hexadecimal notation. If the CRC operation in MSB first mode is necessary in the CRC operation
circuit built in the M16C, switch between the LSB side and the MSB side of the input-holding bits, and carry out the CRC
operation. Also switch between the MSB and LSB of the result as stored in CRC data.
1 0001 0000 0010 0001
1000 0000 0000 0000 0000 0000
1000 1000 0001 0000 1
1000 0001 0000 1000 0
1000 1000 0001 0000 1
1001 0001 1000 1000
1000 1000
LSB
MSB
LSB
MSB
98
1
Modulo-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
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