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93C76A-E/MS データシート(PDF) 13 Page - Microchip Technology

部品番号 93C76A-E/MS
部品情報  1K-16K Microwire Compatible Serial EEPROMs
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

93C76A-E/MS データシート(HTML) 13 Page - Microchip Technology

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© 2007 Microchip Technology Inc.
DS21929D-page 13
93XX46X/56X/66X/76X/86X
3.6
ERASE/WRITE DISABLE And
ENABLE (EWDS/EWEN)
The 93XX series devices power-up in the Erase/Write
Disable (EWDS) state. All programming modes must
be preceded by an Erase/Write Enable (EWEN) instruc-
tion. Once the EWEN instruction is executed, program-
ming remains enabled until an EWDS instruction is
executed or VCC is removed from the device.
To protect against accidental data disturbance, the
EWDS
instruction can be used to disable all Erase/Write
functions
and
should
follow
all
programming
operations.
Execution
of
a
READ
instruction
is
independent of both the EWEN and EWDS instructions.
FIGURE 3-5:
EWDS TIMING
FIGURE 3-6:
EWEN TIMING
CS
CLK
DI
10
00
0
x
•••
x
TCSL
1x
CS
CLK
DI
00
1
1
x
TCSL
•••



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