Rev. 1.00
188
September 11, 2018
Rev. 1.00
189
September 11, 2018
HT45F4050
A/D NFC Flash MCU
HT45F4050
A/D NFC Flash MCU
3A
Command
Tag Device
Response
CMD.
D0
CRC0
90
μ
s
SADR
CRC1
CRC0 CRC1
EADR
...
D(4xN-1)
NAK
PAR.
SADR/EADR error
90
μ
s < Response time < *t
COL
+ 90
μ
s
*t
COL
: Collision time, including *t
RCY
or *t
WCY
respectively
*t
COL
exists if the collision of the NFC memory access by MCU occurs
~ ~
FAST_READ Execution Diagram
NFC Tag Response
ACK and NAK Responses
The
NFC tag device replies with
a 4
-bit ACK
or
NAK code with different values corresponding to
various coditions shown in the following table.
Code (4-bit)
ACK/NAK Descriptions
Ah
Acknowledge – ACK
0h
NAK for invalid command or invalid parameter value, i.e. invalid page address
1h
NAK for parity or CRC error
5h
NAK for EEPROM write error
ATQA Response
The NFC tag device will send 2
bytes of data, known as ATQA, as a response to a REQA or WUPA
command. The 2-byte ATQA value is first sent out with the least significant byte, 44h.
Hex. Value
Bit
16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
00 44h
0
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
Note: bit8 and bit7 of the ATQA response signal indicate double UID size which is defined in the
ISO/IEC 14443 standard. Refer to the ISO/IEC 14443 standard for details.
SAK Response
The NFC tag device will send a Select Acknowledge (SAK) data byte, known as SAK, as a response
to the Select CL1 and Select CL2 commands with a data value of 04h and 00h respectively, as
shown in the following table.
Hex. Value
Bit
8
7
6
5
4
3
2
1
04h
0
0
0
0
0
1
0
0
00h
0
0
0
0
0
0
0
0