Microchip PIC16F84A 8-Bit Flash MCU, 4MHz, 18-Pin DIP

The Microchip PIC16F84A-04/P is a versatile 8-bit CMOS Flash/EEPROM-based microcontroller, offering a robust platform for a wide range of embedded control applications. Operating at 4MHz, it combines performance with reliability, featuring an EEPROM data memory that is both readable and writable during normal operation across the full supply voltage range. This memory is accessed indirectly through special function registers, providing flexible data storage.

A key feature for enhanced system dependability is the integrated watchdog timer, which runs on its own RC oscillator. The device also includes two essential on-chip timers: the Oscillator Start-up Timer (OST) ensures the chip remains in reset until the crystal oscillator stabilises, while the Power-up Timer (PWRT) provides a fixed 72ms nominal delay on power-up. This integrated reset management means most applications require no external reset circuitry, simplifying design and reducing component count.

Core Features

• High-Performance RISC CPU: Features 15 special function hardware registers and an 8-level deep hardware stack for efficient operation.
• High Current Sink/Source: Capable of directly driving LEDs, simplifying output design.
• Long-Term Data Retention: EEPROM offers data retention of greater than 40 years.
• Flexible Programming: Supports In-Circuit Serial Programming™ (ICSP™) via just two pins for easy code updates.
• Reliable Operation: Incorporates Power-on Reset (POR), PWRT, OST, and a dedicated Watchdog Timer (WDT).
• Security & Efficiency: Includes code protection features and a power-saving sleep mode to minimise energy consumption.

With its through-hole DIP package, this microcontroller is well-suited for prototyping, educational use, and industrial control systems where durability and ease of integration are paramount.