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93AA76A Scheda tecnica(PDF) 8 Page - Microchip Technology

Il numero della parte 93AA76A
Spiegazioni elettronici  8K Microwire Compatible Serial EEPROM
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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93AA76A/B/C, 93LC76A/B/C, 93C76A/B/C
DS21796D-page 8
 2004 Microchip Technology Inc.
2.6
ERASE/WRITE DISABLE And ENABLE (EWDS/EWEN)
The 93XX76A/B/C powers 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 2-3:
EWDS TIMING
FIGURE 2-4:
EWEN TIMING
2.7
READ
The READ instruction outputs the serial data of the
addressed memory location on the DO pin. A dummy
zero bit precedes the 8-bit (If ORG pin is low or A-Version
devices) or 16-bit (If ORG pin is high or B-version
devices) output string. The output data bits will toggle on
the rising edge of the CLK and are stable after the spec-
ified time delay (TPD). Sequential read is possible when
CS is held high. The memory data will automatically cycle
to the next register and output sequentially.
FIGURE 2-5:
READ TIMING
CS
CLK
DI
10
00
0
X
•••
X
TCSL
1X
CS
CLK
DI
00
1
1
X
TCSL
•••
CS
CLK
DI
DO
11
0
An
•••
A0
HIGH-Z
0Dx
•••
D0
Dx
•••
D0
•••
Dx
D0


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