AN3955 datasheet(64/68 Pages) STMICROELECTRONICS

tên linh kiện	AN3955

Giải thích chi tiết về linh kiện	This document describes

PDF	68 Pages

Scroll/Zoom	100%

nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

Logo

64 / 68 page

Project example

AN3955

64/68

Doc ID 022017 Rev 1

7.4.2

Detect an ISO/IEC 14443-3 Type A tag function

The ISO14443A_IsPresent function is used to detect an ISO/IEC 14443-3 Type A

contactless tag.

The following table describes how the ISO14443A_IsPresent function detects an

ISO/IEC 14443-3 Type A contactless tag.

Figure 7 described how to detect an ISO/IEC 14443-3 Type A tag.

The name of the used function is User_Get14443Atag (main.c).

Figure 7.

Flowchart of User detects an ISO/IEC 14443-3 Type A tag

Table 101.

Detection of an ISO/IEC 14443-3 Type A contactless tag

Step

Action

The ISO14443A_IsPresent function configures the CR95HF to communicate with

an ISO/IEC 14443-3 Type A contactless tag.

If a tag has been detected, it selects the tag by using the Advanced function

ISO14443A_SelectSequence

It gets the UID. The user function is an Advanced function ISO14443A_GetUID.

MS19955V1

Start

END

Select 14443-3

type A protocol

Send A REQA

command

Select a tag

Get UID

Tag

response ?

Yes

Tag selected ?

Yes

AN3955 bảng dữ liệu(PDF) 64 Page - STMicroelectronics