AT88RF04C-MY1G View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

AT88SC0808/1616/3216/6416CRF, AT88RF04C

6.11. Write System Zone Command, Write Fuse Byte Option [$c4]

The Write Fuse Byte Option of the Write System Zone command is used to program the security fuses.

Reader

PICC

Command >

PARAM = $01 >

L = $00 >

CID

$4

PARAM

ADDR

“L”

DATA 1

CRC1

CRC2

Echo Command >

CID

$4

ACK/NACK

STATUS

CRC1

CRC2

6.11.1. Operation

The Write Fuse Byte Option of the Write System Zone command programs the security fuses. Once programmed, the

fuses cannot be erased. This operation can be performed in the Normal, Authentication, or Encryption Communication

modes. The fuse byte value is never encrypted. Only PICCs in the Active State are permitted to answer this command.

6.11.2. Command Field Description

CID:

The Card ID assigned by the ATTRIB command.

PARAM: The PARAM byte selects the type of write operation to be performed.

Table 38. PARAM byte options for the Write System Zone command

Command

PARAM

ADDR

“L”

Write System Zone

$00

Address

# of bytes – 1

Write System Zone w/ AT

$80

Address

# of bytes – 1

Write Fuse Byte

$01

Fuse addr

$00

All Other Values Are Not Supported

DATA

“L + 1” bytes

“L + 1 bytes”

1 byte

ADDR:

When performing a fuse byte write the ADDR byte contains the address of the fuse; only one fuse may be

programmed per Write System Zone command.

45

5276C–RFID–3/09

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