AK93C45B_03 Datasheet, PDF (7/14 Pages) Asahi Kasei Microsystems – 1K / 2K / 4K / 8Kbit Serial CMOS EEPROM

ASAHI KASEI
[AK93C45B/55B/65B/75B]
EWEN / EWDS
When VCC is applied to the part, the part automatically powers up in the ERASE/WRITE Disable
state. In the ERASE/WRITE disable state, execution of WRITE instruction is disable. Before
WRITE instruction is executed, EWEN instruction must be executed. The ERASE/WRITE enable
state continues until EWDS instruction is executed or VCC is removed from the part.
Execution of a read instruction is independent of both EWEN and EWDS instructions.
CS
SK
0123456789
DI
DO
0100
XXXX
Start bit
EWEN=11
EWDS=00
Hi-Z
AK93C45B output a logic "1" (Ready status),
if previous instruction is WRITE.
X: Don't care
EWEN / EWDS (AK93C45B)
CS
SK
0 1 2 3 4 5 6 7 8 9 10 11
DI
DO
0100
XXXXXX
Start bit
EWEN=11
EWDS=00
Hi-Z
AK93C55B/65B output a logic "1" (Ready status),
if previous instruction is WRITE.
X: Don't care
EWEN / EWDS (AK93C55B/65B)
CS
SK
0 1 2 3 4 5 6 7 8 9 10 11 12 13
DI
DO
0100
XXXXXXXX
Start bit
EWEN=11
EWDS=00
Hi-Z
AK93C75B output a logic "1" (Ready status),
if previous instruction is WRITE.
X: Don't care
EWEN / EWDS (AK93C75B)
DAM04E-02
-7-
2003/05