AS3910-BQFP View Datasheet(PDF) - austriamicrosystems AG
Part Name
Description
MFG CO.
'AS3910-BQFP' PDF : 47 Pages View PDF
AS3910
Data Sheet - Application Information
Table 19. FIFO Status Register
Address # 09: FIFO Status Register
type: R
Bit
Name
Function
Comments
1
fifo_ovr FIFO overflow
0
rx_act
Active receive. This bit is set to 1 when start of
transponder message is detected and stays high until
end of receive.
By reading this bit it can be checked whether transponder is
answering. See also Application Notes (Active receive).
Note: At power up and after direct commands, Set Default and Clear content of this register is set to 0.
Table 20. Collision Register
Address # 0A: Collision Register (for ISO-14443A only)
type: R
Bit
Name
Function
Comments
7
c_byte3
6
c_byte2
Number of full bytes before the bit collision happened
5
c_byte1
4
c_byte0
3
c_bit2
2
c_bit1
Number of bits before the collision in the byte where
the collision happened
1
c_bit0
0
rfu
Not used, always 0
Note: At power up and after direct commands Set Default and Clear content of this register is set to 0.
Table 21. Number of Transmitted Bytes Register 0
Address # 0B: Number of Transmitted Bytes Register 0
type: RW
Bit
Name
Def.
Function
Comments
7
6
ntx1
ntx0
0
0
Number of bytes to be transmitted in one command,
LSB bits
Maximum supported number of bytes is 1023
5
nbtx2
4
nbtx1
3
nbtx0
0
Number of bits in the split byte
0
000 means that all bytes all full
0
Applicable only to ISO-14443A bit oriented
anticollision frame in case last byte is split byte
2
1
frm4
0
antcl
Not used
0 4bit response frame
0 ISO-14443 anticollision frame
Has to be set to 1 when 4bit response frame is
expected (Mifare Ultralight)
Has to be set to 1 when ISO-14443A bit oriented
anticollision frame is sent
Note: Bits frm4 and antcl are cleared after transmission is performed.
Default setting is set at power up and after Set Default command.
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