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| 型號： | MCP451SB |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 13.56 MHz Read/Write Passive RFID Device |
| 中文描述： | 13.56 MHz讀/寫無源RFID器件 |
| 文件頁數(shù)： | 20/50頁 |
| 文件大小： | 1172K |
| 代理商： | MCP451SB |
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MCRF450/451/452/455
DS40232H-page 20
2003 Microchip Technology Inc.
6.2
Anti-collision Command
Controller
This section discusses the anti-collision algorithm and
describes
the
communications
between
the
Interrogator and device.
6.2.1
STRUCTURE OF READ/ WRITE
COMMAND SIGNALS
The Interrogator’s Read/Write commands have the
following structure:
Read/Write command = Command + Address + Data + Parity (or CRC)
The commands are summarized in the table below:
TABLE 6-2:
READ/WRITE COMMANDS FROM INTERROGATOR TO DEVICE
Note:
Command and address are sent MSN (Most
Significant nibble) first.
Data and parity/CRC are sent LSN (Least
Significant nibble) first.
Calculation of Parity and CRC includes Command
code, Address, and Data.
See Microchip Application Note AN752
(DS00752) for the CRC-16 calculation algorithm.
Interrogator
Command
Command
Code
Address
Data
Parity or CRC
Symbol
Length
Unused
0xx
xxxxx
—
—
—
Read 32-bit block
110
aaaaa
—
Parity
3 symbols
Unused
111
00xxx
—
—
—
Unused
111
0100x
—
—
—
End Process
111
01010
—
Parity
3 symbols
Unused
111
01011
—
—
—
Unused
111
011xx
—
—
—
Unused
111
1000x
—
—
—
Set Talk First Bit
111
10010
—
Parity
3 symbols
Set FR Bit
111
10011
—
Parity
3 symbols
Clear Talk First Bit
111
10100
—
Parity
3 symbols
Clear FR Bit
111
10101
—
Parity
3 symbols
Unused
111
1011x
—
—
—
Unused
111
11xxx
—
—
—
Unused
100
xxxxx
—
—
—
Write 32-bit block
101
aaaaa
32 bits
CRC-16
14 symbols
Legend:
aaaaa = Block address
x = don’t care
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| MCP451W | 400000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN |
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