93AA66A 데이터 시트보기 (PDF) - Microchip Technology
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93AA66A Datasheet PDF : 28 Pages
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93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
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) instruction.
Once the EWEN instruction is executed, programming
remains enabled until an EWDS instruction is executed
or Vcc is removed from the device.
FIGURE 2-5:
EWDS TIMING
CS
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.
TCSL
CLK
DI
1
00
00
x
•••
x
FIGURE 2-6:
EWEN TIMING
TCSL
CS
CLK
DI
1
00
1
1x
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
FIGURE 2-7:
READ TIMING
CS
•••
x
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.
CLK
DI
DO
1
1 0 An ••• A0
High-Z
0 Dx ••• D0 Dx ••• D0 Dx ••• D0
© 2005 Microchip Technology Inc.
DS21795C-page 9
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