參數(shù)資料
型號(hào)： MCP455SN
廠商： Microchip Technology Inc.
英文描述： 400000 SYSTEM GATE 1.8 VOLT FPGA - NOT RECOMMENDED for NEW DESIGN
中文描述： 13.56 MHz讀/寫(xiě)無(wú)源RFID器件
文件頁(yè)數(shù)： 39/50頁(yè)
文件大小： 1172K
代理商： MCP455SN
2003 Microchip Technology Inc.
DS40232H-page 39
MCRF450/451/452/455
EXAMPLE 9-4:
TO READ DATA FROM THE DEVICE
To read the content of Block 5 that has been programmed in the previous example, the Interrogator sends the following
command:
Calibration pulse + Read Command (‘
110
’) + Address (‘
00101
’) + Parity (‘
0
’)
= Calibration pulse + C50 (hex)
The gap positions in the 1-of-16 PPM signal for the above hex string are:
12 (C), 5 (5), 0 (0).
Device Response:
When the device receives the above Interrogator command, the device outputs the following 70 kHz Manchester
encoded data string (see
Section 6.2.2 “Structure of Device Response”
):
Preamble (8 bits) + Block number (5 bits, LSB first) + ‘000’ + Block Data (32 bits, LSB first) + SCRC (16 bits)
=
1-1-1-1-1-1-1-0
(f7)
+ 1-0-1-0-0-0-0-0
(5 0)
+ 1-1-1-1 0-1-1-1 1-0-1-1... 1-0-0-0
0-0-0-0
(f e d c 3 2 1 0)
+ 0-1-1-0 0-0-0-0 0-1-0-0 0-1-1-1
(602e).
EXAMPLE 9-5:
TO SEND THE “END PROCESS” COMMAND
The Interrogator command structure (see
Section 6.2 “Anti-collision Command Controller”
) for the End Process is:
Calibration pulse + End Process Command (‘
111
’) + Address (‘
01010
’) + Parity (
1
) = Calibration pulse + EA1 (hex)
The gap positions in the 1-of-16 PPM signal for the above hex string are:
14 (E), 10 (A), 1 (1).
Device Response:
The device outputs the 8-bit preamble (‘
11111110
’) when it receives the End Process command, and enters the
Sleeping Loop.
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