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93LC66A-SN Datasheet(PDF) 6 Page - Microchip Technology

No. de pieza 93LC66A-SN
Descripción Electrónicos  4K 2.5V Microwire Serial EEPROM
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

93LC66A-SN Datasheet(HTML) 6 Page - Microchip Technology

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93LC66A/B
DS21209A-page 6
Preliminary
© 1997 Microchip Technology Inc.
3.6
ERASE/WRITE Disable and Enable
(EWDS/EWEN)
The 93LC66A/B powers up in the ERASE/WRITE Dis-
able (EWDS) state. All programming modes must be
preceded by an ERASE/WRITE Enable (EWEN)
instruction. Once the EWEN instruction is executed,
programming remains enabled until an EWDS instruc-
tion 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 opera-
tions. Execution of a READ instruction is independent
of both the EWDS and EWEN instructions.
3.7
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 (93LC66A) or 16-bit
(93LC66B) output string. The output data bits will toggle
on the rising edge of the CLK and are stable after the
specified time delay (TPD). Sequential read is possible
when CS is held high. The memory data will automati-
cally cycle to the next register and output sequentially.
FIGURE 3-4:
EWDS TIMING
FIGURE 3-5:
EWEN TIMING
FIGURE 3-6:
READ TIMING
CS
CLK
DI
1
0
0
0
0
X
•••
X
TCSL
1
X
CS
CLK
DI
0
0
1
1
X
TCSL
•••
CS
CLK
DI
DO
1
1
0
An
•••
A0
HIGH-Z
0
Dx
•••
D0
Dx
•••
D0
•••
Dx
D0


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