AT88SC6416CRF-MR1 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT88SC6416CRF-MR1

CryptoRF® Specification

Atmel Corporation 

L.4.

Reliability Impact of Anti-Tearing

Each byte of the CryptoRF EEPROM user memory and configuration memory is rated for 100k write cycles minimum.

The entire memory can be written at least 100,000 times without wearing out any of the EEPROM memory bits.

Table 105. CryptoRF Family Write Endurance with Anti-Tearing

Parameter

Min

Typical

Write Endurance (each Byte)

100,000

Anti-Tearing Write Endurance

50,000

Max

Units

Write Cycles

Writes

All anti-tearing write commands sent to a PICC are processed in a single buffer EEPROM memory before being written

to the final EEPROM memory location. As a result, the write endurance for anti-tearing writes is a per-unit specification,

not a per-byte specification. A minimum of 50,000 anti-tearing write commands can be processed without wearing out

any of the buffer EEPROM bits, or the EEPROM Anti-Tearing Flag bits.

L.5.

Activating Anti-Tearing

Anti-Tearing can be used for either User Zone or Configuration Memory writes on 88SC PICCs. Anti-Tearing is

available for User Zone writes only on 88RF PICCs. Activation of this optional feature is described in this section.

The Set User Zone command is used to activate the anti-tearing feature when writing the user memory. To turn anti-

tearing on, send a Set User Zone command with bit 7 in the PARAM byte set to 1b. Any Write User Zone command

that is received following anti-tearing activation will automatically use the anti-tearing write process. To turn anti-tearing

off, send a Set User Zone command with bit 7 in the PARAM byte set to 0b. All subsequent Write User Zone

commands will automatically use the normal write process.

Figure 41. 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

When writing the Configuration Memory on 88SC PICCs the anti-tearing function is controlled by the PARAM byte of

the Write System Zone command. Table 106 shows the PARAM byte options. If the PARAM byte of the Write System

Zone command is $80, then the anti-tearing write process is used. If the PARAM byte of the Write System Zone

command is $00, then the normal write process is used.

Table 106. PARAM byte options for the Write System Zone command for 88SC PICCs.

Command

PARAM

ADDR

“L”

Write System Zone

$00

Address

# of bytes – 1

Write System Zone w A/T

$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

128 AT88SC0808/1616/3216/6416CRF, AT88RF04C

5276C–RFID–3/09

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