Document Version 1.0
Last revised on
2018-‐10-‐22
Page 8 of 79
Reference Manual for uTrust 5501 F Reader/Writer Module
2.4.
Definition of Various Terms and Acronyms
Term or Acronym
Expansion
APDU
Application protocol data unit
ATR
Answer to reset, defined in ISO7816
ATS
Answer to select, defined in ISO/IEC 14443
Byte
Group of 8 bits
CCID
Chip card interface device
CID
Card identifier
DFU
Device firmware upgrade
DR
Divider receive, used to determine the baud rate between the reader
to the card
DS
Divider send, used to determine the baud rate between the card to
the reader
LED
Light emitting diode
MIFARE
The ISO14443 Type A with extensions for security (NXP)
NA
Not applicable
NAD
Node address
Nibble
Group of 4 bits, 1 digit of the hexadecimal representation of a byte
Example:
0xA3 is represented in binary as (10100011)b. The least
significant nibble is 0x3 or (0011)b and the most significant nibble is
0xA or (1010)b.
PCD
Proximity coupling device
PC/SC
Personal computer/smart card, software interface to communicate
between a PC and a smart card
PICC
Proximity integrated chip card
PID
Product ID
Proximity
Distance coverage through ~10 cm
PUPI
Pseudo unique PICC identifier
RF
Radio frequency
RFU
Reserved for future use
USB
Universal serial bus
VID
Vendor ID
(xyz)b
Binary notation of a number x, y, z
∈
{0,1}
0xYY
The byte value YY is represented in hexadecimal
