93LC56A Microchip Technology, 93LC56A Datasheet - Page 6

• Manufacturer Part Number: 93LC56A
• Description: 2K 2.5V Microwave Serial EEPROM
• Manufacturer: Microchip Technology

93LC56A/B
3.6
The 93LC56A/B 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 instruc-
tion is executed or V
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 EWDS and EWEN instructions.
FIGURE 3-4:
FIGURE 3-5:
FIGURE 3-6:
DS21208A-page 6
CLK
CLK
DO
CS
CS
DI
CLK
DI
CS
DI
ERASE/WRITE Disable and Enable
(EWDS/EWEN)
HIGH-Z
1
EWDS TIMING
EWEN TIMING
READ TIMING
CC
1
1
is removed from the device. To
1
0
0
0
0
0
An
0
1
•••
0
A0
1
0
Preliminary
Dx
X
X
•••
3.7
The READ instruction outputs the serial data of the
addressed memory location on the DO pin. A dummy
zero bit precedes the 8-bit (93LC56A) or 16-bit
(93LC56B) output string. The output data bits will toggle
on the rising edge of the CLK and are stable after the
specified time delay (T
when CS is held high. The memory data will automati-
cally cycle to the next register and output sequentially.
•••
•••
D0
Dx
READ
X
X
•••
T
T
CSL
CSL
D0
PD
). Sequential read is possible
1997 Microchip Technology Inc.
Dx
•••
D0