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The EM78P458AP is an 8-bit microcontroller manufactured by EMC (Elan Microelectronics Corp). Below are the factual specifications, descriptions, and features of the device:

Manufacturer Specifications (EMC)

• Architecture: 8-bit RISC
• Operating Voltage: 2.2V to 5.5V
• Clock Speed: DC to 20 MHz (crystal or RC oscillator)
• Program Memory (ROM): 4K x 13-bit OTP (One-Time Programmable)
• RAM: 148 x 8-bit
• EEPROM: 64 x 8-bit (optional)
• I/O Pins: Up to 12 bidirectional I/O pins
• Interrupts: 6 interrupt sources (including external, timer, and ADC)
• Timers:
• 8-bit Timer/Counter (TCC) with prescaler
• Watchdog Timer (WDT) with prescaler
• ADC: 8-bit, 4-channel (shared with I/O pins)
• PWM: 1 channel (8-bit resolution)
• Power-Saving Modes: HALT and SLEEP modes
• Package: 18-pin DIP/SOP

Descriptions

The EM78P458AP is a low-power, high-performance microcontroller designed for cost-sensitive embedded applications. It features an efficient RISC architecture with a compact instruction set, making it suitable for consumer electronics, home appliances, and industrial control systems.

Features

• Low Power Consumption: Optimized for battery-operated devices.
• On-Chip Oscillator: Supports RC or crystal modes.
• Built-in WDT: Ensures system reliability.
• Multiple Interrupt Sources: Enhances real-time responsiveness.
• Compact Instruction Set: 55 instructions for efficient coding.
• Wide Operating Voltage: Supports 2.2V to 5.5V for flexible power supply options.
• OTP Memory: Allows one-time programming for secure firmware storage.

This information is based on the manufacturer's datasheet and technical documentation.