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AS3955 bảng dữ liệu(PDF) 50 Page - ams AG

tên linh kiện AS3955
Giải thích chi tiết về linh kiện  NFC Forum Compliant Dynamic Tag
PDF  102 Pages
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nhà sản xuất  AMSCO [ams AG]
Trang chủ  http://www.ams.com
Logo AMSCO - ams AG

AS3955 bảng dữ liệu(HTML) 50 Page - ams AG

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[v1-04] 2016-Feb-03
AS3955 − Detailed Description
Figure 51:
Data Transmission from MCU to NFC Device
When the NFC device has successfully read all data from the
buffer, it shall clear the buffer and prepare for further data
transfer by issuing a WRITE command to address FFh. This will
trigger a Tx end interrupt.
If a READ command is received on address FCh prior to the
Transmit Buffer command, AS3955 will return zero data, io_busy
set to 1 and io_data_rdy set to 0. A NFC device can then poll
AS3955 by continuously sending READ commands at address
FCh and waiting until the last word equals 01h.
A READ command can be issued only to address FCh. Issuing a
READ command to any other address than FCh while in
Extended mode shall be treated as an error.
In Extended mode, it is assumed that AS3955 will always receive
16 bytes and transmit 12 bytes of data, 3 empty bytes and 1
byte for FLAGS. If the message size differs in any direction, then
the MCU or NFC device are responsible for proper error
management.
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