User's Manual

ACR1251U-C User Manual
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Version 1.00.00
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Page 6 of 13
3.0. Architecture
AT90SCR is for main processor for communication with PC, and control the contactless chip,
communication with ICC contact 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-C and PC is using CCID protocol.
All the communication between ICC and PICC are PCSC
Compliant
PICC and ICC are working exclusively, when ICC inserted, PICC will be disabled.