U3280M_07 Datasheet, PDF (12/21 Pages) ATMEL Corporation – Transponder Interface for Microcontroller

5.2.2.1
5.2.2.2
5.2.2.3
5.2.2.4
Read One Data Byte
START Control byte A Data byte 1 N STOP
Read Two Data Bytes
START
Read n Data Bytes
Control byte A Data byte 1 A Data byte 2 N STOP
START Control byte A Data byte 1 A Data byte 2 A - - - - - - Data byte n N STOP
A →acknowledge, N →no acknowledge
Read Control Bytes
Read Low Byte First, Address Increment
MSB
A4 A3 A2 A1 A0 C1
Row address
0
LSB
C0 R/NW
1
1
Byte Order
LB(R) HB(R)
LB(R+1) HB(R+1) - - - -
LB(R+n) HB(R+n)
5.2.3
Read High Byte First, Address Decrement
MSB
A4 A3 A2 A1 A0 C1
Row address
1
LSB
C0 R/NW
0
1
Byte Order
HB(R) LB(R) HB(R-1) LB(R-1)
HB: high byte; LB: low byte; R: row address
----
HB(R-n) LB(R-n)
Initialization after a Reset Condition
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.
12 U3280M
4688D–RFID–03/07