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93C56B 데이터시트(PDF) 9 Page - Microchip Technology

부품명 93C56B
상세설명  2K Microwire Compatible Serial EEPROM
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

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© 2008 Microchip Technology Inc.
DS21794F-page 9
93AA56A/B/C, 93LC56A/B/C, 93C56A/B/C
2.6
Erase/Write Disable and Enable
(EWDS/EWEN)
The 93XX56A/B/C powers up in the Erase/Write
Disable (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 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 opera-
tions. Execution of a READ instruction is independent of
both the EWEN and EWDS instructions.
FIGURE 2-5:
EWDS TIMING
FIGURE 2-6:
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 2-7:
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
0
Dx
•••
D0
Dx
•••
D0
•••
Dx
D0


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