Microchip PIC16F84AT-20/SO 8-bit Microcontroller Datasheet and Technical Overview

The PIC16F84AT-20/SO is a member of Microchip’s classic PIC16F8x family of 8-bit microcontrollers, renowned for its robust performance and ease of use in embedded control applications. Housed in an 18-pin SOIC (Small Outline Integrated Circuit) package, this microcontroller combines a proven architecture with one-time programmable (OTP) EPROM program memory, making it a cost-effective solution for both medium-volume production and development.

At the core of the PIC16F84AT-20/SO is a high-performance RISC CPU. All instructions are single-cycle (200 ns) except for program branches, which require two cycles, enabling efficient and deterministic execution of code. The device operates at a maximum frequency of 20 MHz, as denoted by the "-20" in its part number, and can function over a standard voltage range of 4.0V to 5.5V.

A key feature of this microcontroller is its 1K x 14 words of EPROM program memory and 68 bytes of RAM data memory. It also includes 64 bytes of EEPROM data memory, which can be electrically erased and rewritten, allowing for the storage of critical data that must persist even when power is removed. This non-volatile memory is highly durable, supporting up to 10 million erase/write cycles.

The I/O capabilities are managed through two bidirectional ports: Port A (5 bits) and Port B (8 bits). Each pin can be individually configured as an input or output, providing direct drive for LEDs and other peripherals without the need for additional interface circuitry. The device also includes a host of integrated peripherals, such as a real-time clock/counter (Timer0 module) and an interrupt controller, supporting both external and internal interrupt sources.

For development and programming, the PIC16F84A supports In-Circuit Serial Programming (ICSP) via two pins (RB6 and RB7), greatly simplifying the process of code updates and system debugging without removing the chip from the circuit board. This feature, combined with its wide operating voltage range and power-saving SLEEP mode, makes it exceptionally versatile for a broad spectrum of applications, including automotive systems, industrial controls, consumer electronics, and security devices.

ICGOODFIND: The PIC16F84AT-20/SO remains a highly reliable and cost-efficient 8-bit microcontroller. Its blend of sufficient memory, flexible I/O, and enduring EEPROM technology makes it an excellent choice for designers seeking a proven solution for dedicated control tasks.

Keywords: 8-bit Microcontroller, PIC16F84A, EEPROM Memory, In-Circuit Serial Programming (ICSP), RISC Architecture.