hn58v1001 Renesas Electronics Corporation., hn58v1001 Datasheet - Page 18

• Manufacturer Part Number: hn58v1001
• Description: 1m Eeprom 128-kword ? 8-bit Ready/busy And Res Function
• Manufacturer: Renesas Electronics Corporation.

HN58V1001 Series
2. Data Protection at V
Note: The EEPROM should be kept in unprogrammable state during V
Rev.8.00, Nov. 28. 2003, page 18 of 21
When V
2.1 Protection by RES
as a trigger and turn the EEPROM to program mode by mistake. To prevent this unintentional
programming, the EEPROM must be kept in an unprogrammable state while the CPU is in an unstable
state.
The unprogrammable state can be realized by that the CPU’s reset signal inputs directly to the
The EEPROM brakes off programming operation when RES becomes low, programming operation
signal.
EEPROM’s RES pin. RES should be kept V
doesn’t finish correctly in case that RES falls low during programming operation. RES should be
kept high for 15 ms after the last data input.
CC
is turned on or off, noise on the control pins generated by external circuits (CPU, etc) may act
9-
or
4-5
V
+-
CC
CC
CPU
RESET
V
On/Off
CC
*
Unprogrammable
1 µs min
Program inhibit
100 µs min
SS
level during V
15 ms min
*
Unprogrammable
CC
CC
Program inhibit
on/off.
on/off by using CPU RESET