U3280M 데이터 시트보기 (PDF) - Atmel Corporation

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U3280M

Transponder Interface for Microcontroller

Atmel Corporation 

Figure 4-4. Serial Protocol

SCL

U3280M

SDA

Stand- START

by condition

Data

valid

Data Data/

change acknowledge

valid

STOP Stand-

condition by

Control Byte Format

START A4

EEPROM address

A3

A2

A1

Mode control

bits

Read/

NWrite

A0

C1

C0

R/NW Ackn

The control byte follows the START condition and consists of the 5-bit row address, 2 mode con-

trol bits and the read/not-write bit.

Data Transfer Sequence

START Control byte Ackn

Data byte

Ackn

Data byte

Ackn

STOP

• After the STOP condition and before the START condition the device is in standby mode and

the SDA line is switched to an input with the pull-up resistor.

• The START condition follows a control byte that determines the following operation. Bit 0 of

the control byte is used to control the following transfer direction. A “0” defines a write access

and a “1” defines a read access.

9

4688D–RFID–03/07

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