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MCP795W21 数据表(PDF) 39 Page - Micro Analog systems

部件名 MCP795W21
功能描述  SPI Real-Time Clock Calendar
PDF  54 Pages
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制造商  MAS [Micro Analog systems]
网页  http://www.mas-oy.com
标志 MAS - Micro Analog systems

MCP795W21 数据表(HTML) 39 Page - Micro Analog systems

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 2011 Microchip Technology Inc.
Preliminary
DS22280A-page 39
MCP795WXX/MCP795BXX
FIGURE 10-2:
WRITE SEQUENCE
10.1.4
WRITE TO THE UNLOCK REGISTER
The MCP795XXX contains a protected area of 64 bits
that can be used to hold a unique ID, such as a serial
number or MAC address code. To gain write access to
these locations, a specific sequence is required. Any
deviation from this sequence will reset the lock on
these locations. Once these locations have been
unlocked they have to be written to in the next com-
mand by issuing the correct command. A write to a dif-
ferent location will lock the ID locations and clear the
WEL bit.
The following is a list of strict conditions which have to
be followed before the unique locations can be written
to:
• EEWREN instruction successfully executed
• UNLOCK 0x55 instruction successfully executed
• UNLOCK 0xAA instruction successfully executed
To issue each Unlock instruction the UNLOCK com-
mand is sent followed by 0x55. Then in a separate
command the UNLOCK command is issued followed
by 0xAA. It is a requirement that each command be
separate, that is CS must toggle between each com-
mand.
Information on how to read and write the ID locations
is detailed in Section 9.1.6, Unique ID Locations.
FIGURE 10-3:
UNLOCK SEQUENCE
SO
SI
SCK
CS
0
23456789 10 11 12 13 14 15 16 17 18 19 20 21 22
1
00
0
1
0
0
0
A7 6
5
4
1A0 76543210
Instruction
Address Byte
Data Byte
High-Impedance
23
32
1
SO
SI
SCK
CS
0
234567
89 10 11 12 13 14 15
1
10
0
1
0
0
0
76
5
4
10
Instruction
Data
High-Impedance
32
0



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