Key facts
- Manuals
- 2
- Languages
- ZH
- Last added
- 2012-01-25
Featured EM78P458/459 manuals

EMC EM78P458/459 OTP ROM Datasheet
The EM78P458 and EM78P459 are low‑power 8‑bit microcontrollers fabricated with a high‑speed CMOS process. They integrate a 4 K × 13‑bit one‑time‑programmable ROM, 84 × 8‑bit SRAM, two bidirectional I/O ports, an 8‑level stack, a real‑time timer/counter, an 8‑bit ADC and two PWM generators.
The document provides detailed pin assignments, functional block diagrams, register maps, and electrical specifications such as operating voltage, temperature ranges, current consumption, and recommended crystal/ceramic resonator values. Package options include 20‑pin DIP/SOP and 24‑pin skinny‑DIP/SOP variants. This manual is written in Chinese.
Covers: Overview · Features · Package Types · Pin Assignment · Functional Block Diagram · Register Description

Mochi EM78P458/459 OTP ROM Datasheet
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.
Covers: Overview · Features · Pin Assignment · Register Description · Electrical Characteristics · Package Information
Latest EM78P458/459 manuals
EMC EM78P458/459 OTP ROM Datasheet
Datasheet 56 pages · 2.4 MB · ZHTechnical specifications for the EMC EM78P458/459 8‑bit OTP ROM microcontroller, covering features, pinout, electrical characteristics and package options.
Mochi EM78P458/459 OTP ROM Datasheet
Datasheet 56 pages · 1 MB · ZHTechnical datasheet for the EM78P458/459 OTP ROM microcontroller, covering features, pinout, specifications and package options.
Which document do I need?
Datasheet
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in EM78P458/459 manuals
What is the operating voltage range of the EM78P458/459?
The device operates from 2.3 V to 5.5 V.
How many I/O ports does the EM78P458/459 provide?
It provides two bidirectional I/O ports.
What is the operating voltage range of the EM78P458/459?
The device operates from 2.3 V up to 5.5 V.
How much current does the EM78P458/459 draw in active mode?
It consumes about 1.5 mA when running at 5 V and 4 MHz.
