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The EM78257 is an 8‑bit microcontroller with a 2 K×13‑bit mask ROM and a range of configurable options, including built‑in RC oscillators, watchdog timer, and multiple I/O ports. It is offered in 18‑lead and 20‑lead DIP and SOP packages and operates from 2.3 V to 5.5 V.
The document details general description, key features, pin assignments for both EM78257A and EM78257B variants, functional block diagram, register descriptions, AC electrical characteristics, and package information in the appendix.
| Operating voltage range | 2.3 V ~ 5.5 V |
|---|---|
| Operating temperature range (commercial) | 0 °C ~ 70 °C |
| Operating temperature range (industrial) | -40 °C ~ 85 °C |
| On‑chip ROM size | 2 K × 13 bits |
| Typical current consumption at 5 V/4 MHz | < 1.5 mA |
| Built‑in RC oscillator frequencies | 4 MHz, 1 MHz, 455 kHz, 32.768 kHz |
The device operates from 2.3 V up to 5.5 V.
The EM78257A is available in an 18‑lead package.
The industrial temperature range extends to 85 °C.
The microcontroller contains 2 K × 13 bits of ROM.