Advanced Card Systems Ltd. ACR123 Manuel de l'utilisateur - Page 6

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3.0. Architecture

STM32 be the main processor for communication with POS, control the contactless chip, SAM and

Peripherals. RC531 act as a contactless chip

To perform communication between Main processor and contactless tag

Carrier

Frequency

= 13.56MHz

For software architecture, ACR123 built-in simple OS that used for tasks management, resource

management, etc. Tasks included PICC Polling, SAM checking, Serial and USB communication flow,

etc.

ACR123 User Manual

Version 1.00.00

Page 6 of 13

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