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93C66BXIOT 数据表(PDF) 8 Page - Microchip Technology

部件名 93C66BXIOT
功能描述  4K Microwire Compatible Serial EEPROM
Download  24 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

93C66BXIOT 数据表(HTML) 8 Page - Microchip Technology

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93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795B-page 8
 2003 Microchip Technology Inc.
2.6
ERASE/WRITE DISABLE And ENABLE (EWDS/EWEN)
The 93XX66A/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 indepen-
dent 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
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 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
0Dx
•••
D0
Dx
•••
D0
•••
Dx
D0


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