u3280m ATMEL Corporation, u3280m Datasheet - Page 12

• Manufacturer Part Number: u3280m
• Description: Transponder Interface For Microcontroller U3280m
• Manufacturer: ATMEL Corporation

5.2.2.1
5.2.2.2
5.2.2.3
5.2.2.4
5.2.3
12
U3280M
Initialization after a Reset Condition
Read One Data Byte
Read Two Data Bytes
Read n Data Bytes
Read Control Bytes
The EEPROM with the serial interface has reset circuitry on-chip. In systems with microcontrol-
lers that have their own reset circuitry for power-on reset, watchdog reset or brown-out reset, it
may be necessary to bring the U3280M into a known state independently of the internal reset.
This is performed by reading one byte without acknowledging and then generating a STOP
condition.
A
START
START
START
Read Low Byte First, Address Increment
Byte Order
LB(R)
Read High Byte First, Address Decrement
Byte Order
HB(R)
HB: high byte; LB: low byte; R: row address
MSB
MSB
A4
A4
acknowledge, N
Control byte
A3
A3
HB(R)
LB(R)
Control byte
Control byte
Row address
Row address
A2
A2
no acknowledge
LB(R+1)
HB(R-1)
A Data byte 1 A Data byte 2 A
A1
A1
A Data byte 1
A Data byte 1
HB(R+1)
LB(R-1)
A0
A0
C1
C1
0
1
A Data byte 2
N STOP
- - - -
- - - -
C0
C0
1
0
LB(R+n)
HB(R-n)
R/NW
R/NW
LSB
LSB
1
1
- - - - - -
N STOP
HB(R+n)
LB(R-n)
Data byte n N STOP
4688D–RFID–03/07