AT88RF04C-MY1G データシートの表示（PDF） - Atmel Corporation

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AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

AT88SC0808/1616/3216/6416CRF, AT88RF04C

6.2. Set User Zone Command [$c1]

The Set User Zone command selects the user memory area to be addressed by the Read User Zone and Write User

Zone commands.

Reader

PICC

Command >

CID

$1

PARAM

CRC1

CRC2

Echo Response >

CID

$1

ACK/NACK

STATUS

CRC1

CRC2

6.2.1. Operation

Before reading and writing data to the user memory, the host must select a User Zone with this command. Only one

User Zone may be selected at a time. At the time the zone is selected the host also chooses whether anti-tearing is

active for the selected zone. If anti-tearing is activated, then all writes to the User Zone will utilize anti-tearing until a

new Set User Zone command is received. Only PICCs in the Active State are permitted to answer this command.

6.2.2.

Command Field Description

CID:

The Card ID assigned by the ATTRIB command.

PARAM: Selects the User Zone and sets anti-tearing on or off.

Table 16. Definition of the PARAM byte of the Set User Zone command

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

AT

0

0

0

User Zone

Table 17.

Bit 7

0

1

Coding of the Anti-Tearing Select bit within the PARAM byte

Write User Zone

Normal Write Enabled

Anti-Tearing Write Enabled

21

5276C–RFID–3/09

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