Microchip PIC16F873-20/SP 8-Bit Microcontroller Datasheet and Application Overview
The Microchip PIC16F873-20/SP is a high-performance, 8-bit microcontroller belonging to the versatile PIC16F87X family. Fabricated with Microchip’s advanced Flash technology, this 28-pin device offers a robust set of integrated peripherals, making it a popular choice for a wide range of embedded control applications. The -20 suffix denotes its maximum operating frequency of 20 MHz, enabling a instruction cycle time of 200 ns for time-critical operations.
Housed in a 28-pin SPDIP (SP) package, the PIC16F873 is designed for through-hole mounting, facilitating prototyping and production in various educational and industrial environments. Its core architecture is built around a RISC-based CPU with only 35 single-word instructions, simplifying programming and reducing code complexity. The device features 4 KB of Flash program memory, which is reprogrammable, allowing for significant flexibility during development and field updates. It is also supported by 192 bytes of RAM and 128 bytes of EEPROM data memory for storing critical variables without power.
A key strength of the PIC16F873 lies in its rich peripheral set. It includes three I/O ports (Port A, B, and C), providing up to 22 programmable I/O pins. These pins can interface directly with sensors, actuators, LEDs, and keypads. The integrated 10-bit Analog-to-Digital Converter (ADC) with 5 channels is essential for acquiring data from analog sensors like thermistors or potentiometers. For communication, the microcontroller is equipped with multiple serial interfaces: a Master Synchronous Serial Port (MSSP) that can be configured for either I²C or SPI protocol, and a Universal Synchronous Asynchronous Receiver Transmitter (USART) for RS-232/485 communications.
Two internal hardware timers, Timer0 and Timer1, provide precise timing and event counting capabilities. A third timer, Timer2, is particularly useful for generating Pulse-Width Modulation (PWM) signals, which are crucial for controlling motor speed or LED brightness. This is further enhanced by two Capture/Compare/PWM (CCP) modules, offering additional flexibility for timing and waveform generation.
Development and Programming are streamlined through the In-Circuit Serial Programming (ICSP) capability, allowing the microcontroller to be programmed even after being soldered onto a target board. This feature, combined with an extensive suite of development tools from Microchip and the third-party community, including the MPLAB X IDE and various C compilers, accelerates the design cycle from concept to deployment.
Typical applications for the PIC16F873-20/SP are extensive, spanning:
Automotive Systems: Simple sensor interfaces and actuator control.
Industrial Control: Small-scale programmable logic controllers (PLCs), sensor nodes, and motor control units.
Consumer Electronics: Interactive displays, smart chargers, and remote controls.
Hobbyist and Educational Projects: Its through-hole package makes it a staple on breadboards for learning embedded systems.
ICGOODFIND: The PIC16F873-20/SP stands as a highly integrated and capable 8-bit microcontroller. Its balanced combination of ample Flash memory, versatile peripherals (ADC, USART, MSSP, CCP), and a robust development ecosystem makes it an enduring and reliable solution for engineers and hobbyists tackling a diverse array of embedded design challenges.
Keywords: PIC16F873, 8-bit Microcontroller, Flash Memory, Peripheral Integration, Embedded Control
