ACR123 User Manual
Version 1.00.00
www.acs.com.hk
Page 6 of 13
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
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.
Carrier
Frequency
= 13.56MHz
