U3280M_07 ATMEL [ATMEL Corporation], U3280M_07 Datasheet - Page 9

• Manufacturer Part Number: U3280M_07
• Description: Transponder Interface for Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

4688D–RFID–03/07
Figure 4-4.
Control Byte Format
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
• After the STOP condition and before the START condition the device is in standby mode and
• The START condition follows a control byte that determines the following operation. Bit 0 of
START
START
the SDA line is switched to an input with the pull-up resistor.
the control byte is used to control the following transfer direction. A “0” defines a write access
and a “1” defines a read access.
SDA
SCL
Stand-
by
Control byte
A4
Serial Protocol
condition
START
A3
EEPROM address
Ackn
A2
valid
Data
Data byte
A1
change
Data
A0
Ackn
acknowledge
Mode control
Data/
C1
valid
bits
Data byte
C0
NWrite
STOP
condition
Read/
R/NW
Ackn
Stand-
STOP
by
U3280M
Ackn
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