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</tr>
<tr class="tablebody">
<td>00000000</td>
<td>0</td>
</tr>
<tr class="tablebodyalt">
<td>00000000</td>
<td>1</td>
</tr>
<tr class="tablebody">
<td>10001100</td>
<td>0 2</td>
</tr>
<tr class="tablebodyalt">
<td>01000110 </td>
<td>0<u> </u></td>
</tr>
<tr class="tablebody">
<td>00100011</td>
<td>0</td>
</tr>
<tr class="tablebodyalt">
<td>10011101</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>11000010</td>
<td>0 0</td>
</tr>
<tr class="tablebodyalt">
<td>01100001</td>
<td>0<u> </u></td>
</tr>
<tr class="tablebody">
<td>10111100</td>
<td>0</td>
</tr>
<tr class="tablebodyalt">
<td>01011110</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>00101111 </td>
<td>1 C</td>
</tr>
<tr class="tablebodyalt">
<td>00010111</td>
<td>1<u> </u></td>
</tr>
<tr class="tablebody">
<td>00001011</td>
<td>1</td>
</tr>
<tr class="tablebodyalt">
<td>00000101</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>10001110</td>
<td>0 1</td>
</tr>
<tr class="tablebodyalt">
<td>01000111</td>
<td>0<u> </u></td>
</tr>
<tr class="tablebody">
<td>10101111</td>
<td>0</td>
</tr>
<tr class="tablebodyalt">
<td>11011011</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>11100001</td>
<td>0 8</td>
</tr>
<tr class="tablebodyalt">
<td>11111100</td>
<td>1<u> </u></td>
</tr>
<tr class="tablebody">
<td>11110010</td>
<td>1</td>
</tr>
<tr class="tablebodyalt">
<td>11110101</td>
<td>1</td>
</tr>
<tr class="tablebody">
<td>01111010</td>
<td>0 B</td>
</tr>
<tr class="tablebodyalt">
<td>00111101</td>
<td>1<u> </u></td>
</tr>
<tr class="tablebody">
<td>00011110</td>
<td>1</td>
</tr>
<tr class="tablebodyalt">
<td>10000011</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>11001101</td>
<td>0 1</td>
</tr>
<tr class="tablebodyalt">
<td>11101010</td>
<td>0<u> </u></td>
</tr>
<tr class="tablebody">
<td>01110101</td>
<td>0</td>
</tr>
<tr class="tablebodyalt">
<td>10110110</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>01011011</td>
<td>0 0</td>
</tr>
<tr class="tablebodyalt">
<td>10100001</td>
<td>0<u> </u></td>
</tr>
<tr class="tablebody">
<td>11011100</td>
<td>0</td>
</tr>
<tr class="tablebodyalt">
<td>01101110</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>00110111</td>
<td>0 0</td>
</tr>
<tr class="tablebodyalt">
<td>10010111</td>
<td>0<u> </u></td>
</tr>
<tr class="tablebody">
<td>11000111</td>
<td>0</td>
</tr>
<tr class="tablebodyalt">
<td>11101111</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>11111011</td>
<td>0 0</td>
</tr>
<tr class="tablebodyalt">
<td>11110001</td>
<td>0<u> </td>
</tr>
<tr class="tablebody">
<td>11110100</td>
<td>0</td>
</tr>
<tr class="tablebodyalt">
<td>01111010</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>00111101</td>
<td>0 0</td>
</tr>
<tr class="tablebodyalt">
<td>10010010</td>
<td>0<u> </u></td>
</tr>
<tr class="tablebody">
<td>01001001</td>
<td>0</td>
</tr>
<tr class="tablebodyalt">
<td>10101000</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>01010100</td>
<td>0 0</td>
</tr>
<tr class="tablebodyalt">
<td>00101010</td>
<td>0<u> </u></td>
</tr>
<tr class="tablebody">
<td>00010101</td>
<td>0</td>
</tr>
<tr class="tablebodyalt">
<td>10000110</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>01000111</td>
<td>0 0</td>
</tr>
<tr class="tablebodyalt">
<td>10101101</td>
<td>0<u> </u></td>
</tr>
<tr class="tablebody">
<td>11011010</td>
<td>0</td>
</tr>
<tr class="tablebodyalt">
<td>01101101</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>10111010</td>
<td>0 0</td>
</tr>
<tr class="tablebodyalt">
<td>01011101</td>
<td>0<u> </u></td>
</tr>
<tr class="tablebody">
<td colspan="2">10100010 = A2 Hex = CRC Value for [00000001B81C (Serial Number) + 02 (Family Code)]</td>
</tr>
<tr class="tablebodyalt">
<td>10100010</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>01010001</td>
<td>1</td>
</tr>
<tr class="tablebodyalt">
<td>00101000</td>
<td>0 2</td>
</tr>
<tr class="tablebody">
<td>00010100</td>
<td>0<u> </u></td>
</tr>
<tr class="tablebodyalt">
<td>00001010</td>
<td>0</td>
</tr>
<tr class="tablebody">
<td>00000101</td>
<td>1</td>
</tr>
<tr class="tablebodyalt">
<td>00000010</td>
<td>0 A</td>
</tr>
<tr class="tablebody">
<td>00000001</td>
<td>1<u> </u></td>
</tr>
<tr class="tablebodyalt">
<td colspan="2">00000000 = 00 Hex = CRC Value for A2 [(CRC) + 00000001B81C (Serial Number) + 02 (Family Code)]</td>
</tr>
</table><br>
<b>例3. DOW CRC查询函数</b><br>
<pre>
Var
CRC : Byte;
Procedure Do_CRC(X: Byte);
{
This procedure calculates the cumulative Maxim 1-Wire CRC of all bytes passed to it.<br>The result accumulates in the global variable CRC.
}
Const
Table : Array[0..255] of Byte = (
0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53);
Begin
CRC := Table[CRC xor X];
End;
</pre>
<span class="btext">表1. 查表方式计算DOW CRC</span>
<table border="0" cellspacing="1" cellpadding="2">
<tr class="tablehead">
<td class="tablehead">Current CRC Value (= Current Table Index)</td>
<td class="tablehead">Input Data</td>
<td class="tablehead">New Index (= Current CRC xor Input Data)</td>
<td class="tablehead">Table (New Index) (= New CRC Value)</td>
</tr>
<tr class="tablebody">
<td>0000 0000 = 00 Hex</td>
<td>0000 0010 = 02 Hex</td>
<td>(00 H xor 02 H) = 02 Hex = 2 Dec</td>
<td>Table[2]= 1011 1100 = BC Hex = 188 Dec</td>
</tr>
<tr class="tablebodyalt">
<td>1011 1100 = BC Hex</td>
<td>0001 1100 = 1C Hex</td>
<td>(BC H xor 1C H) = A0 Hex = 160 Dec</td>
<td>Table[160]= 1010 1111 = AF Hex = 175 Dec</td>
</tr>
<tr class="tablebody">
<td>1010 1111 = AF Hex</td>
<td>1011 1000 = B8 Hex</td>
<td>(AF H xor B8 H) = 17 Hex = 23 Dec</td>
<td>Table[23]= 0001 1110 = 1E Hex = 30 Dec</td>
</tr>
<tr class="tablebodyalt">
<td>0001 1110 = 1E Hex</td>
<td>0000 0001 = 01 Hex</td>
<td>(1E H xor 01 H) = 1 F Hex = 31 Dec</td>
<td>Table[31]= 1101 110 = DC Hex = 220 Dec</td>
</tr>
<tr class="tablebody">
<td>1101 1100 = DC Hex</td>
<td>0000 0000 = 00 Hex</td>
<td>(DC H xor 00 H) = DC Hex = 220 Dec</td>
<td>Table[220]= 1111 0100 = F4 Hex = 244 Dec</td>
</tr>
<tr class="tablebodyalt">
<td>11110100 = F4 Hex</td>
<td>0000 0000 = 00 Hex</td>
<td>(F4 H xor 00 H) = F4 Hex = 244 Dec</td>
<td>Table [244]= 0001 0101 = 15 Hex = 21 Dec</td>
</tr>
<tr class="tablebody">
<td>0001 0101 = 15 Hex</td>
<td>0000 0000 = 00 Hex</td>
<td>(15 H xor 00 H) = 15 Hex = 21 Dec</td>
<td>Table[21]= 1010 0010 = A2 Hex = 162 Dec</td>
</tr>
<tr class="tablebodyalt">
<td>1010 0010 = A2 Hex</td>
<td>10100010 = A2 Hex</td>
<td>(A2 H xor A2 H) = Hex = 0 Dec</td>
<td>Table[0]=0000 0000 = 00 Hex = 0 Dec</td>
</tr>
</table><br>
<h3>带有CRC寄存器1的补码CRC寄存器</h3>
<span class="btext">表2. CRC寄存器值输入</span>
<table border="0" cellspacing="1" cellpadding="2">
<tr class="tablebody">
<td>X<sub>0</sub></td>
<td>X<sub>1</sub></td>
<td>X<sub>2</sub></td>
<td>X<sub>3</sub></td>
<td>X<sub>4</sub></td>
<td>X<sub>5</sub></td>
<td>X<sub>6</sub></td>
<td>X<sub>7</sub></td>
<td>X<sub>7</sub>*</td>
</tr>
<tr class="tablebodyalt">
<td>1</td>
<td>X<sub>0</sub></td>
<td>X<sub>1</sub></td>
<td>X<sub>2</sub></td>
<td>X<sub>3</sub>*</td>
<td>X<sub>4</sub>*</td>
<td>X<sub>5</sub></td>
<td>X<sub>6</sub></td>
<td>X<sub>6</sub>*</td>
</tr>
<tr class="tablebody">
<td>1</td>
<td>1</td>
<td>X<sub>0</sub></td>
<td>X<sub>1</sub></td>
<td>X<sub>2</sub>*</td>
<td>X<sub>3</sub></td>
<td>X<sub>4</sub>*</td>
<td>X<sub>5</sub></td>
<td>X<sub>5</sub>*</td>
</tr>
<tr class="tablebodyalt">
<td>1</td>
<td>1</td>
<td>1</td>
<td>X<sub>0</sub></td>
<td>X<sub>1</sub>*</td>
<td>X<sub>2</sub>*</td>
<td>X<sub>3</sub></td>
<td>X<sub>4</sub>*</td>
<td>X<sub>4</sub>*</td>
</tr>
<tr class="tablebody">
<td>0</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>X<sub>0</sub></td>
<td>X<sub>1</sub>*</td>
<td>X<sub>2</sub></td>
<td>X<sub>3</sub></td>
<td>X<sub>3</sub>*</td>
</tr>
<tr class="tablebodyalt">
<td>1</td>
<td>0</td>
<td>1</td>
<td>1</td>
<td>0</td>
<td>X<sub>0</sub>*</td>
<td>X<sub>1</sub>*</td>
<td>X<sub>2</sub></td>
<td>X<sub>2</sub>*</td>
</tr>
<tr class="tablebody">
<td>1</td>
<td>1</td>
<td>0</td>
<td>1</td>
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