EM78458/459 MASK ROM is a low power, high speed 8-bit microprocessor in the EM78 series, with a built-in 4K*13-bit ROM
The EM78458 and EM78459 are 8‑bit microprocessors with a built‑in 4 K×13‑bit ROM and a range of integrated peripherals, including ADC, PWM, comparators, and a real‑time clock. The document lists operating voltage and temperature ranges, power consumption, and package options.
Detailed sections cover pin assignments for the 20‑pin DIP, 20‑pin SOP, 24‑pin skinny DIP, and 24‑pin SOP packages, functional block diagrams, register descriptions, and AC electrical characteristics such as timing parameters and reset requirements.
| Operating voltage range | 2.3V~5.5V |
|---|---|
| Operating temperature range (commercial) | 0°C~70°C |
| Operating temperature range (industrial) | -40°C~85°C |
| Power consumption at 5V/4MHz | < 1.5 mA |
| On‑chip ROM size | 4 K × 13 bits |
| On‑chip SRAM registers | 84 × 8 bits |
| Package: EM78458AP | 20‑pin DIP, 300 mil |
| Package: EM78458AM | 20‑pin SOP, 300 mil |
| Package: EM78459AK | 24‑pin skinny DIP, 300 mil |
| Package: EM78459AM | 24‑pin SOP, 300 mil |
The device operates from 2.3 V to 5.5 V.
The EM78458AP package has 20 pins.
It consumes less than 1.5 mA.
A 4 K × 13‑bit read‑only memory (ROM) is integrated on the chip.