SR176 datasheet(23/35 Pages) STMICROELECTRONICS

23 / 35 page

SR176

Device operations (instructions)

23/35

Figure 35.

GET_PROTECTION frame exchange between Reader and SR176

5.9

Power-on state

After Power-on, the SR176 is in the following state:

●

The device is in the low power mode.

●

The device is deselected.

●

The device presents its highest impedance to the reader antenna field.

●

It will not answer to any command except INITIATE.

Table 4.

Chip_ID and LOCK_REG

Block 15

bits

Response

parameter bits

Meaning

b15

LOCK_REG b7

1: Blocks 14 and 15 are write-protected (0: indicates that write-access is allowed)

b14

LOCK_REG b6

1: Blocks 12 and 13 are write-protected (0: indicates that write-access is allowed)

b13

LOCK_REG b5

1: Blocks 10 and 11 are write-protected (0: indicates that write-access is allowed)

b12

LOCK_REG b4

1: Blocks 8 and 9 are write-protected (0: indicates that write-access is allowed)

b11

LOCK_REG b3

1: Blocks 6 and 7 are write-protected (0: indicates that write-access is allowed)

b10

LOCK_REG b2

1: Blocks 4 and 5 are write-protected (0: indicates that write-access is allowed)

LOCK_REG b1

1: Blocks 2 and 3 are write-protected (0: indicates that write-access is allowed)

LOCK_REG b0

1: Blocks 0 and 1 are write-protected (0: indicates that write-access is allowed)

b4 to b7

Chip_ID b4 to b7

Reserved

b0 to b3

Chip_ID b0 to b3

Chip_ID (Value from 0h to Fh)

SOF Chip_ID

AI07716B

LOCK_REG

Reader

SR176

CRCL CRCH EOF

SOF

08h

CRCL CRCH EOF

0Fh

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