AK6420A Datasheet, PDF (8/15 Pages) Asahi Kasei Microsystems – 2K / 4K / 8Kbit Serial CMOS EEPROM

ASAHI KASEI
[AK6420B/40B/80B]
WREN / WRDS ( Write Enable and Write Disable )
When Vcc is applied to the part, it powers up in the programming disable (WRDS) state.
Programming must be preceded by a programming enable (WREN) instruction. Programming
remains enabled until a programming disable (WRDS) instruction is executed or Vcc is removed
from the part. The programming disable instruction is provided to protect against accidental data
disturb. Execution of a read instruction is not affected by both WREN and WRDS instructions.
DAS03E-00
-8-
1999/05