User's Manual

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ACR1251U-A2CNCA500
Design Specification
Version 1.00.00
Page 6 of 13
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3.0. Architecture
AT90SCR is for main processor for communication with PC, and control the contactless chip,
communication with SAM card and
peripherals. PN512 act as a contactless chip to perform the
communication between contactless tags and AT90SCR
For communication architecture, the protocol between ACR1251U and PC is using CCID protocol.
The communication between SAM is PCSC
Compliant
ACR1251U
PCSC SAM
Interface
PSCS Layer
ISO7816 Part 1-4 SAM
(Optional)
T=CL & T=1
Emulation
ISO14443
Part1-4
PICC Interface
SAM (Socket)
PICC (Built-in
Antenna)
USB
Interface
(CCID)
Physical
Interface
ACR1251
Proprietary API