Datasheet
41
AT30TSE752A/754A/758A [DATASHEET]
Atmel-8854G-DTS-AT30TSE752A-754A-758A-Datasheet_102014
The Write Protection status can be checked to see if the memory array is in full protection or not by sending a Start
condition followed by 01100011 (63h), if the AT30TSE752A/754A/758A responds with a NACK, this indicates the
memory array is in full write protect. Likewise, if the AT30TSE752A/754A/758A responds with an ACK, this indicates the
memory array is not protected.
Table 10-3. Software Write Protection for Serial EEPROM
Note: V
HV
= A
0
Pin High Voltage. See Section 12.3, “DC Characteristics” on page 45 for more information.
Figure 10-6. Set Reversible Software Write Protect
Notes: 1. Apply GND at A
2
and A
1
pins and V
HV
at A
0
pin.
2. X = Don't care
Figure 10-7. Clear Reversible Software Write Protect
Notes: 1. Apply GND at A2 and V
CC
at A
1
pin and V
HV
at A
0
pin.
2. X = Don't care
Command
Device Address Pin RSWP Write R/W
A2 A1 A0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Set RSWP GND GND V
HV
0 1 1 0 0 0 1 0
Clear RSWP GND V
CC
V
HV
0 1 1 0 0 1 1 0
SCL
SDA
Device Address Byte Word Address Byte Data Byte
Start
by
Master
ACK
from
Slave
ACK
from
Slave
MSB
MSB
ACK
from
Slave
Stop
by
Master
MSB
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
0 1 1 0 0 0 1 0 0 X X X X X X X X 0 X X X X X X X X 0
SCL
SDA
Device Address Byte Word Address Byte Data Byte
Start
by
Master
ACK
from
Slave
ACK
from
Slave
MSB
MSB
ACK
from
Slave
Stop
by
Master
MSB
1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9
0 1 1 0 0 1 1 0 0 X X X X X X X X 0 X X X X X X X X 0