HN58V65AT-10 HITACHI [Hitachi Semiconductor], HN58V65AT-10 Datasheet - Page 21

• Manufacturer Part Number: HN58V65AT-10
• Description: 64 k EEPROM (8-kword x 8-bit) Ready/Busy function, RES function (HN58V66A)
• Manufacturer: HITACHI [Hitachi Semiconductor]

2. Data protection at V
When V
act 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.
Note: The EEPROM shoud be kept in unprogrammable state during V
(1) Protection by CE, OE, WE
To realize the unprogrammable state, the input level of control pins must be held as shown in the table
below.
CE
OE
WE
V
V
: Don’t care.
CC
SS
: Pull-up to V
: Pull-down to V
signal.
CC
is turned on or off, noise on the control pins generated by external circuits (CPU, etc) may
CC
level.
SS
CPU
RESET
level.
V
CC
CC
on/off
*
Unprogrammable
V
CC
HN58V65A Series, HN58V66A Series
V
SS
*
Unprogrammable
CC
on/off by using CPU RESET
V
CC