T5557 datasheet(13/30 Pages) ATMEL

13 / 30 page

T5557

4517E–RFID–02/03

Figure 15. T5557 Functional Diagram

T5557 in Extended

Mode (X-mode)

In general, the block 0 setting of the master key (bits 1 to 4) to the value ‘6’ or ‘9’

together with the X-mode bit will enable the extended mode functions.

•

Master key = ‘9’: Test mode access and extended mode are both enabled.

•

Master key = ‘6’: Any test mode access will be denied but the extended mode is still

enabled.

Any other master key setting will prevent the activation of the T5557 extended mode

options, even when the X-mode bit is set.

Binary Bit-rate Generator In extended mode the data rate is binary programmable to operate at any data rate

between RF/2 and RF/128 as given in the formula below.

Data rate = RF/(2n+2)

Setup modes

Command decode

Write

Number of bits

Password check

Lock bit check

Program & Verify

Modulation defeat

fail

data = old

data = new

Data verification failed

fail

data = old

gap

command mode

fail

data = old

Power-on reset

OP(00)

Write

OP(1p)*

OP(01)

Start

Gap

Regular-read mode

addr = 1 .. maxblk

Block-read mode

addr = current

gap

single gap

AOR mode

AOR = 1

AOR = 0

Page 0 or 1

* p = page selector

Direct access OP (1p)*

Page 0

OP (1p)*

OP(10..)

OP(11..)

Page 1

Page 0

Test-mode

if master key <> 6

Reset

to page 0

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