DS1963L

13 of 24

MEMORY FUNCTION EXAMPLE

Update purse file in page 12: Read Memory + Counter, Write Scratchpad, Copy Scratchpad.

MASTER MODE

DATA (LSB FIRST)

COMMENTS

TX

Reset

Reset pulse (480-960

µs)

RX

Presence

Presence Pulse

TX

CCh

Issue “skip ROM” command

TX

A5h

Issue “read memory + counter” command

TX

80h

TA1, beginning offset=80h

TX

01h

TA2, address=0180h

RX

<32 data bytes>

Read 32 bytes of data

RX

<4 data bytes>

Read Write Cycle Counter of page 12

RX

<4 data bytes>

Read Tamper Detect Bytes of device

RX

<2 data bytes>

Read(inverted) CRC16

TX

Reset

Reset pulse

RX

Presence

Presence pulse

TX

CCh

Issue “skip ROM” command

TX

0Fh

Issue “write scratchpad” command

TX

80h

Read TA1, beginning offset=80h

TX

01h

Read TA2, address=0180h

TX

<32 data bytes>

Write 32 bytes of data to scratchpad

RX

<2 data bytes>

Read (inverted) CRC16

TX

Reset

Reset pulse

RX

Presence

Presence pulse

TX

CCh

Issue “skip ROM” command

TX

5Ah

Issue “copy scratchpad” command

TX

80h

TX

01h

TX

1Fh

TA1

TA2

AUTHORIZATION CODE

E/S

RX

<1 data byte>

Read Copy scratchpad response

TX

Reset

Reset pulse

RX

Presence

Presence pulse, done