RWD_QT Datasheet, PDF (12/19 Pages) rfsolutions.ltd – The MicroRWD “QT” (Quad-Tag) version is a complete 125kHz reader solution for Hitag 1,

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Hitag 1 Serial Number and Configuration Bytes
Page 0 (Serial Number):
MSB
LSB
Byte:
3
2
1
0
(xxxxxxxx)
msb lsb
Page 1 (Configuration Bytes):
MSB
LSB
Byte:
3
2
1
0
Read/Write Read/Write CON1 CON0
The Hitag 1 configuration bytes control whether the memory blocks are read/write or locked
for read only access. Note that bytes 2 and 3 of the configuration page are not used and are
currently available for general read/write use.
CON 0 (Page 1, byte 0)
CON 1 (Page 1, byte 1)
b7 b6 b5 b4 b3 b2 b1 b0
b7 b6 b5 b4 b3 b2 b1 b0
11
1
0 = Block 7 read only
Reserved
1 = Block 7 read/write
Reserved
0 = Block 6 read only
1 = Block 6 read /write
Reserved
0 = Block 5 read only
1 = Block 5 read/write
0 = Configuration (Page 1) read only
1 = Configuration (Page 1) read/write
0 = Block 4 read only
1 = Block 4 read/write
0 = Block 3 read only
1 = Block 3 read/write (not used)
Reserved
Reserved
Reserved
0 = Block 2 read only
1 = Block 2 read/write (not used)
Note that these configuration bits are OTP. Once they are set to read-only the Hitag 1
transponder is hardware protected and they can never be changed.
Note that the “Reserved” bits of Configuration Byte 1 must not be altered. Page 1 must be
read first and the bits that can be changed masked on/off before writing back.
12