AS3955 datasheet(50/102 Pages) AMSCO

номер детали	AS3955

подробное описание детали	NFC Forum Compliant Dynamic Tag

PDF	102 Pages

Scroll/Zoom	100%

производитель	AMSCO [ams AG]

домашняя страница	http://www.ams.com

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Page 50

ams Datasheet

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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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AS3955 датащи(PDF) 50 Page - ams AG