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AT24CSW04X Scheda tecnica(PDF) 25 Page - Microchip Technology

Il numero della parte AT24CSW04X
Spiegazioni elettronici  I짼C-Compatible (Two-Wire) Serial EEPROM with a Security Register and Software Write Protection 4?멚bit (512 x 8), 8?멚bit (1,024 x 8)
PDF  43 Pages
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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AT24CSW04X Scheda tecnica(HTML) 25 Page - Microchip Technology

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8.4
Reading the Write Protection Register
To read the contents of the WPR, a random read operation must be sent to the device (see Random Read) so that
the reserved word address bits A7 and A6 can properly be set. It is not possible to read the contents of the WPR with
a current address read.
When reading the WPR contents, data bit 7 through 4 will always read as a logic ‘0’ as seen in Table 8-4.
Figure 8-3. Read Write Protection Register
SCL
SDA
Start
by
Host
Device Address Byte
Word Address Byte
MSb
MSb
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
0
1
1
#(2) @(1)
#
0
0
Dummy Write
Start
by
Host
Device Address Byte
WPR Contents
Stop
by
Host
MSb
MSb
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
9
1
0
1
1
#(2) @(1)
#
1
0
0
0
0
0
D3
D2 D1 D0
1
1
1
X
X
X
X
X
X
0
ACK
from
Client
ACK
from
Client
ACK
from
Client
NACK
from
Host
Notes: 
1.
For the AT24CSW04X, the @ indicates the A1 address bit which is managed by the ordering code of the
device (see Table 6-3). For the AT24CSW08X, the @ indicates the A9 address bit.
2.
# indicates the hardware address value which is managed by the ordering code of the device (see Table 6-3
and Table 6-4).
AT24CSW04X/AT24CSW08X
Write Protection
© 2020-2021 Microchip Technology Inc.
and its subsidiaries
Datasheet
DS20006426B-page 25



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