93AA86A MICROCHIP [Microchip Technology], 93AA86A Datasheet - Page 9

• Manufacturer Part Number: 93AA86A
• Description: 16K Microwire Compatible Serial EEPROM
• Manufacturer: MICROCHIP [Microchip Technology]

2.6
The 93XX86A/B/C powers up in the Erase/Write
Disable (EWDS) state. All programming modes must be
preceded by an Erase/Write Enable (EWEN) instruction.
FIGURE 2-3:
FIGURE 2-4:
2.7
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.
FIGURE 2-5:
© 2005 Microchip Technology Inc.
CLK
CLK
CS
DO
CS
DI
CLK
DI
CS
DI
Erase/Write Disable and Enable
(EWDS/EWEN)
Read
93AA86A/B/C, 93LC86A/B/C, 93C86A/B/C
High-Z
1
1
1
EWDS TIMING
EWEN TIMING
READ TIMING
1
0
0
0
0
0
An
0
1
•••
0
A0
1
0
Dx
x
x
•••
Once the EWEN instruction is executed, programming
remains enabled until an EWDS instruction is executed
or V
To protect against accidental data disturbance, the
EWDS instruction can be used to disable all Erase/Write
functions
operations. Execution of a READ instruction is
independent of both the EWEN and EWDS instructions.
The output data bits will toggle on the rising edge of the
CLK and are stable after the specified time delay (T
Sequential read is possible when CS is held high. The
memory data will automatically cycle to the next register
and output sequentially.
•••
•••
D0
CC
is removed from the device.
Dx
and
x
x
•••
T
T
CSL
CSL
should
D0
Dx
follow
•••
all
DS21797G-page 9
D0
programming
PD
).