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11AA020-E/P データシート(PDF) 13 Page - Microchip Technology

部品番号 11AA020-E/P
部品情報  1K-16K UNI/O짰 Serial EEPROM Family Data Sheet
PDF  38 Pages
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

11AA020-E/P データシート(HTML) 13 Page - Microchip Technology

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© 2008 Microchip Technology Inc.
Preliminary
DS22067E-page 13
11AAXXX/11LCXXX
4.4
Write Enable (WREN) and Write
Disable (WRDI) Instructions
The 11XX contains a write enable latch. See Table 6-1
for the Write-Protect Functionality Matrix. This latch
must be set before any write operation will be com-
pleted internally. The WREN instruction will set the
latch, and the WRDI instruction will reset the latch.
The following is a list of conditions under which the
write enable latch will be reset:
• Power-up
• WRDI instruction successfully executed
• WRSR instruction successfully executed
• WRITE instruction successfully executed
• ERAL instruction successfully executed
• SETAL instruction successfully executed
FIGURE 4-4:
WRITE ENABLE COMMAND SEQUENCE
FIGURE 4-5:
WRITE DISABLE COMMAND SEQUENCE
Note: The WREN and WRDI instructions must
be terminated with a NoMAK following
the command byte. If a NoMAK is not
received at this point, the command will
be considered invalid, and the device
will go into Idle mode without responding
with a SAK or executing the command.
11
0
1
0
1
00
Start Header
SCIO
Device Address
00
0
0
1
0
10
Command
10
0
1
0
0
11
Standby Pulse
SCIO
11
0
1
0
1
00
Start Header
SCIO
Device Address
00
0
0
1
0
10
Command
01
0
1
0
0
10
Standby Pulse
SCIO



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