AT88RF04C-MY1G 查看數據表（PDF） - Atmel Corporation

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AT88RF04C-MY1G

CryptoRF® Specification

Atmel Corporation 

AT88SC0808/1616/3216/6416CRF, AT88RF04C

6.9. Write System Zone Command [$c4]

The Write System Zone command writes data to the configuration memory.

Reader

PICC

Command >

PARAM = $00 >

CID

$4

PARAM

ADDR

“L”

DATA 1

DATA 2

……….

DATA “L”

DATA “L+1”

CRC1

CRC2

Echo Command >

CID

$4

ACK/NACK

STATUS

CRC1

CRC2

6.9.1. Operation

The Write System Zone command writes data into the configuration memory. As each byte is clocked in to the memory

the lower bits of the address are internally incremented. The upper address bits are not incremented, so the page

address remains constant.

Write operations cannot cross page boundaries; a Write System Zone command can only write data bytes within a

single physical memory page. Attempts to write beyond the end of the page boundary will wrap to the beginning of the

same page. Only PICCs in the Active State are permitted to answer this command.

If Authentication or Encryption Communication Security is active the DATA bytes written to the password (PW)

registers are encrypted; no other bytes are encrypted. In the Normal Communication Security mode none of the bytes

are encrypted.

The Write System Zone command includes an automatic data verification function when used on 88RF PICCs. After

the EEPROM write is complete the data verification logic reads the new EEPROM contents and compares it to the data

received in the Write System Zone command. If the data does not match then the PICC returns a NACK response with

$ED in the status byte. If the data matches, the PICC returns an ACK response.

39

5276C–RFID–3/09

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