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93LC46BT-E/MSG датащи(PDF) 9 Page - Microchip Technology

номер детали 93LC46BT-E/MSG
подробное описание детали  1K Microwire Compatible Serial EEPROM
PDF  28 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

93LC46BT-E/MSG датащи(HTML) 9 Page - Microchip Technology

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© 2005 Microchip Technology Inc.
DS21749F-page 9
93AA46A/B/C, 93LC46A/B/C, 93C46A/B/C
2.6
Erase/Write Disable and Enable
(EWDS/EWEN)
The 93XX46A/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 operations. 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 specified 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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