參數(shù)資料
型號(hào)： MCP455P
廠(chǎng)商： Microchip Technology Inc.
英文描述： 13.56 MHz Read/Write Passive RFID Device
中文描述： 13.56 MHz讀/寫(xiě)無(wú)源RFID器件
文件頁(yè)數(shù)： 37/50頁(yè)
文件大?。?/td> 1172K
代理商： MCP455P
2003 Microchip Technology Inc.
DS40232H-page 37
MCRF450/451/452/455
EXAMPLE 9-2:
CALCULATION OF MATCHING CODE FOR TAG ID = 825FE1A0 (HEX, MSB
FIRST)
The “match” part of the matching code is calculated by the Bit-Wise Equation in Equation 6-2:
“Match (8 bits)” = Tag ID bit range a:b = {4(TC)}modulo 32: {4(TC + 1) + 3} modulo 32
For TC = 2, the above equation gives a = 8, and b = 15.
The “Match (8 bits)” is chosen from (8th 9th 10th 11th) and (12th 13th 14th 15th) bits of the Tag ID.
Therefore, for the Tag ID = 825FE1A0 (hex) =
b/1000 0010 0101 1111 1110 0001 1010 0000/,
“Match (8 bits)” =
b/1110 0001/
= 1E (hex).
Using this “Match” part, a complete set of matching code is assembled as:
1E5 for MC1, and
1E9 for MC2
where:
5 in the MC1 was from
b/0101/
(
010
for MC1 and the last ‘
1
’ is a parity bit),
9 in the MC2 was from
b/1001/
(
100
for MC2 and the last ‘
1
’ is a parity bit).
Gap position in the 1-of-16 PPM signal for the calculated MC codes:
The gap position numbers in the 1-of-16 PPM for the calculated MC codes are (see Figure 6-9 for 1-of-16 PPM):
Positions 1, 14, and 5 for 1E5 for MC1 code
Positions 1, 14, and 9 for 1E9 for MC2 code.
The “Match” part of the matching code for various TCs are given in Table 9-1.
TABLE 9-1:
CALCULATED “MATCH” FOR TAG ID = 825FE1A0 (HEX)
TC
“Match (8 bits) in hex”
0
0A
1
A1
2
1E
3
EF
4
F5
5
52
6
28
7
80
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