2001 Oct 01

7

Philips Semiconductors

Product specification

HITAG 2 stick transponder

HT2DC20S20

Table 2

Format of page 3

Table 3

Bits of the configuration byte

Notes

1. The coding in HITAG 2 operation is depending on bit 0.

2. The setting of this bit is One Time Programmable (OTP).

Do not set bit 6 of the configuration byte to logic 1 before having written the final data into page 3 (including the

configuration byte and password TAG) of the transponder.

3. The setting of this bit is One Time Programmable (OTP).

Do not set bit 7 of the configuration byte to logic 1 before having written the final data into pages 1 and 2 of the

transponder.

Table 4

Standard values of the configuration byte

PAGE 3

bit 31

bit 24

bit 23

bit 0

configuration byte (8 bits)

password TAG (24 bits)

76543210

BIT

VALUE

DESCRIPTION

REMARK

0

0

Manchester code

does effect HITAG 2 operation only

1

biphase code

does effect HITAG 2 operation only

2, 1

00

public mode B

coding biphase; note 1

01

public mode A

coding Manchester; note 1

10

public mode C

coding biphase; note 1

11

HITAG 2

coding depending on bit 0; note 1

3

0

password mode

1

crypto mode

4

0

pages 6 and 7 read/write

1

pages 6 and 7 read-only

5

0

pages 4 and 5 read/write

1

pages 4 and 5 read/write

6

0

page 3 read/write

1

page 3 read-only

configuration byte and password TAG fixed; note 2

7

0

pages 1 and 2 read/write

1

pages 1 no read and write

note 3

page 2 read-only

when transponder is in password mode

page 3 no read and write

when transponder is in crypto mode

MODE SELECTION

VALUE

Password mode

0x06

Crypto mode

0x0E

Public mode A

0x02

Public mode B

0x00

Public mode C

0x04