User's Manual

ACR122L
-
USB
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ACS
Pseudo APDUs for Contactless Interface and Peripherals Control
6.0. PICC Interface Description
6.1. ATR Generation
If the reader detects a PICC, an ATR will be sent to the PCSC driver for identifying the PICC.
1.1 ATR format for ISO 14443 Part 3 PICCs.
Byte Value
(Hex)
Designation Description
0 3B Initial Header
1 8N T0 Higher nibble 8 means: no TA1, TB1, TC1 only
TD1 is following.
Lower nibble N is the number of historical bytes
(HistByte 0 to HistByte N-1)
2 80 TD1 Higher nibble 8 means: no TA2, TB2, TC2 only
TD2 is following.
Lower nibble 0 means T = 0
3 01 TD2 Higher nibble 0 means no TA3, TB3, TC3, TD3
following.
Lower nibble 1 means T = 1
80 T1 Category indicator byte, 80 means A status
indicator may be present in an optional
COMPACT-TLV data object
4F Application identifier Presence Indicator
0C Length
RID Registered Application Provider Identifier (RID) #
A0 00 00 03 06
SS Byte for standard
C0 .. C1
Tk
Bytes for card name
4
To
3+N
00 00 00 00 RFU RFU # 00 00 00 00
4+N UU TCK Exclusive-oring of all the bytes T0 to Tk
e.g. ATR for MIFare 1K = {3B 8F 80 01 80 4F 0C A0 00 00 03 06 03 00 01 00 00 00 00 6A}
Length (YY) = 0x0C
RID = {A0 00 00 03 06} (PC/SC Workgroup)
Standard (SS) = 03 (ISO14443A, Part 3)
Card Name (C0 .. C1) = {00 01} (MIFare 1K)