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UPD754264 Datasheet(PDF) 16 Page - NEC |
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UPD754264 Datasheet(HTML) 16 Page - NEC |
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16 / 68 page  16 µPD754264 6. EEPROM The µPD754264 incorporates 32 words × 8 bit EEPROM (Electrically Erasable PROM) as well as static RAM (128 words × 4 bit) as a data memory. The EEPROM incorporated into the µPD754264 has the following features. (1) Written data is retained if power is turned off. (2) 8-bit data manipulation (auto-erase/auto-write) is available by memory manipulation instruction as well as for static RAM. However available instructions are restricted. (3) It can reduce loads of software because the auto-erase and/or auto-write operation is performed by hardware. (4) Write operation control using the interrupt request The interrupt request is generated under following conditions. • Terminates write operation • Write status flag It is possible to check whether enables or disables write operation by bit manipulation instructions. |
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