AT90RF135602 ATMEL, AT90RF135602 Datasheet - Page 24

• Manufacturer Part Number: AT90RF135602
• Description: INTEGRATED 13.56 MHz CONTACTLESS READER WITH EMBEDED SOFTWARE
• Manufacturer: ATMEL

A3 Lock Bit Functionality
Lock Byte 0
Lock Byte 1
24
0x80, 0x84, 0xA0,
0xA4 commands
0x90, 0xB0, 0xB4
commands
Memory locations
Memory locations
locked (decimal)
locked (decimal)
0x80, 0x84, 0xA0,
0x90, 0xB0, 0xB4
commands
commands
0xA4
MSB – 7
MSB – 7
56 – 63*
72 – 79*
unused
unused
This section outlines the operation of the lock bits located at logical address 8 & 9 for
commands 0x90, 0xB0, 0xB4.
The Lock bits are used to ‘write protect’ blocks of memory.
For example, bit 0 of lock byte 0 locks the first 8 data bytes (addresses 0x10 to 0x17 for
commands 0x90, 0xB0, 0xB4)
Bit 1 of lock byte 0 locks the second block of 8 data bytes (addresses 0x18 to 0x1F for
commands 0x90, 0xB0, 0xB4)
The correlation between lock bits and areas of logical memory locked is shown in the
table below:
48 – 55*
64 – 71*
unused
unused
6
6
40 – 47
56 – 63
unused
unused
5
5
32 – 39
48 – 55
unused
unused
4
4
Bit
Bit
104 –111*
88 – 95*
24 – 31
40 – 47
3
3
96 – 103*
80 – 87*
16 – 23
32 – 39
2
2
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72 – 79*
88 – 95*
08 – 15
24 – 31
1
1
4407A–SCR–04/05
LSB - 0
64 – 71*
80 – 87*
LSB - 0
00 – 07
16 – 23