EM78P458/459 OTP ROM is an 8-bit microcontroller using low-power, high-speed COMS technology. It has a 4k*13-bit ROM (OTP-ROM) that can be burned once. Therefore, users can easily improve and improve the program. Program code can be written to the chip using an EMC programmer.
The EM78P458/459 is a low‑power, high‑speed 8‑bit microcontroller with an on‑chip 4 K × 13‑bit OTP ROM. It includes SRAM, multiple I/O pins, ADC, PWM, comparators and various operating modes such as sleep and watchdog.
The document provides functional descriptions, pin assignments, register details, electrical characteristics and package information for both DIP and SOP variants. This manual is written in Chinese.
| Operating voltage | 2.3 V – 5.5 V |
|---|---|
| Operating temperature (commercial) | 0 °C – 70 °C |
| Operating temperature (industrial) | -40 °C – 85 °C |
| Active mode current | 1.5 mA @ 5 V/4 MHz |
| Typical low‑power current | 15 µA @ 3 V/32 kHz |
| Sleep mode current | 1 µA |
| OTP ROM size | 4 K × 13 bits |
| SRAM size | 84 × 8 bits |
| General‑purpose I/O pins | 8 pins |
The device operates from 2.3 V up to 5.5 V.
It consumes about 1.5 mA when running at 5 V and 4 MHz.
The OTP ROM provides 4 K × 13 bits of storage.
There are 8 general‑purpose I/O pins.