HN58C65P-25 Ver la hoja de datos (PDF) - Hitachi -> Renesas Electronics

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HN58C65P-25

8192-word × 8-bit Electrically Erasable and Programmable CMOS ROM

Hitachi -> Renesas Electronics 

HN58C65 Series

2. Data Protection at VCC On/Off

When V CC is turned on or off, noise on the control pins generated by external circuits (CPU, etc.) may 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.

VCC

CPU

RESET

*Unprogrammable

* Unprogrammable

*The EEPROM should be kept in unprogrammable

state during VCC on/off by using CPU RESET signal.

In addition, when VCC is turned on or off, the input level of on control pins must be held as shown in the

table below.

CE

VCC

X

X

OE

X

VSS

X

WE

X

X

VCC

X: Don’t care.

VCC: Pull-up to VCC level

VSS: Pull-down to VSS level.

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