93C56A Microchip Technology, 93C56A Datasheet - Page 6

• Manufacturer Part Number: 93C56A
• Description: 2K 5.0V Automotive Temperature Microwire Serial EEPROM
• Manufacturer: Microchip Technology

93C56A/B
3.6
The device powers up in the ERASE/WRITE Disable
(EWDS) state. All programming modes must be pre-
ceded by an ERASE/WRITE Enable (EWEN) instruc-
tion. 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 EWEN and EWDS instructions.
FIGURE 3-4:
FIGURE 3-5:
FIGURE 3-6:
DS21206B-page 6
CLK
CLK
DO
CS
CS
DI
DI
CLK
CS
DI
ERASE/WRITE Disable and Enable
(EWDS/EWEN)
HIGH-Z
1
READ TIMING
EWDS TIMING
EWEN TIMING
CC
1
1
is removed from the device. To
1
0
0
0
0
0
An
0
1
•••
A0
0
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 (93C56A) or 16-bit
(93C56B) 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
1998 Microchip Technology Inc.
Dx
•••
D0