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MCP79411 Datasheet(PDF) 24 Page - Microchip Technology

Part # MCP79411
Description  Battery-Backed I2C??Real-Time Clock/Calendar with EEPROM and Unique ID
PDF  60 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP79411 Datasheet(HTML) 24 Page - Microchip Technology

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MCP79410/MCP79411/MCP79412
DS20002266E-page 24
 2010-2013 Microchip Technology Inc.
FIGURE 8-4:
UNIQUE ID UNLOCK SEQUENCE
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
S
T
A
R
T
CONTROL
BYTE
ADDRESS
BYTE
DATA
S
T
O
P
A
C
K
A
C
K
A
C
K
S 110 1
0
1 11
P
0
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
S
T
A
R
T
CONTROL
BYTE
ADDRESS
BYTE
DATA BYTE 0
S
T
O
P
A
C
K
A
C
K
A
C
K
DATA BYTE 7
A
C
K
S 10 1 0
0
P
1
00 01 00 1
0 1 0 1 0 1 0 1
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
S
T
A
R
T
CONTROL
BYTE
ADDRESS
BYTE
DATA
S
T
O
P
A
C
K
A
C
K
A
C
K
S 110 1
0
1 11
P
00 0 0 1 0 0 1
101 0 1 01 0
1 1 1 00 00
11 1
REGISTER 8-2:
UNLOCK ID 0X09
W-0
UNIQUE UNLOCK ID SEQUENCE
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
“0” = Bit is clear
“X” = Bit is unknown
bit 7-0
UNLOCK ID: This is the unlock sequence address. To unlock write access to the unique ID area in
the EEPROM, a sequence must be written to this address in separate commands. The process is
shown in Figure 8-4.



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