Pin Function Grouping

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For a part project like this, each terminal should belong to one primary functional group only, not be repeated across multiple overlapping groups. The recommended rule is to assign every pin exactly one section/group, with power and ground separated cleanly, and for MCUs to group GPIO-style pins by their shared prefix or bank .
A cleaner non-duplicated grouping for this device would be:

Functional groups

GroupPins
PowerVDD_1, VDD_2
GroundVSS_1, VSS_2
ControlMCLR/VPP
ClockOSC1/CLKI, OSC2/CLKO
Port ARA0/AN0, RA1/AN1, RA2/AN2/VREF-/CVREF, RA3/AN3/VREF+, RA4/T0CKI/C1OUT, RA5/AN4/SS/C2OUT
Port BRB0/INT, RB1, RB2, RB3/PGM, RB4, RB5, RB6/PGC, RB7/PGD
Port CRC0/T1OSO/T1CKI, RC1/T1OSI/CCP2, RC2/CCP1, RC3/SCK/SCL, RC4/SDI/SDA, RC5/SDO, RC6/TX/CK, RC7/RX/DT
Port DRD0/PSP0, RD1/PSP1, RD2/PSP2, RD3/PSP3, RD4/PSP4, RD5/PSP5, RD6/PSP6, RD7/PSP7
Port ERE0/RD/AN5, RE1/WR/AN6, RE2/CS/AN7
That matches the guidance to:
  • put VDD/VSS into dedicated power/ground groupings
  • put clock pins into a clock group
  • put reset/configuration into control
  • group MCU I/O pins by their shared port prefix like Port A, Port B, etc., instead of repeating them again in analog, communication, or debug buckets .
So yes:
  • good: Power = VDD_1, VDD_2
  • good: Ground = VSS_1, VSS_2
  • good: Port B = RB0 ... RB7
  • not ideal: putting RB6/PGC in both Port B and Debug
If you want, I can next turn this into the exact Flux-style properties for each terminal:
  • Section
  • Pin Group
  • Sub-symbol Designator Suffix
Avoid duplicate grouped pins
Clean up duplicate pins
Use unique pin membership
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    kicad_mod

    DIP1550W56P254L5219H483Q40N.kicad_mod

    FP_DIP1550W56P254L5219H483Q40NFootprint
    stp

    PIC16F877A-I_P.stp

    3D_PIC16F877A-I_P3D Model
    image-removebg-preview (1).png

    image-removebg-preview (1).png

    image-removebg-preview (1)Thumbnail

    PIC16F877A-I/P

    PIC16F877A-I/P thumbnail
    PIC PIC® 16F Microcontroller IC 8-Bit 20MHz 14KB (8K x 14) FLASH 40-PDIP The PIC16F877A-I/P is a high-performance 8-bit microcontroller from Microchip Technology, based on a Harvard architecture with separate program and data memory buses. It is designed for a wide range of embedded applications requiring reliable processing, multiple communication interfaces, and analog capability. The device integrates Flash program memory, EEPROM data storage, and numerous peripherals including ADC, timers, serial communication modules, and PWM functions. Packaged in a 40-pin PDIP form factor, it is widely used in industrial automation, consumer electronics, and educational development systems. Core Features 8-bit PIC microcontroller architecture Harvard architecture with RISC instruction set Operating frequency up to 20 MHz Single-cycle instruction execution (except branches) Memory Program Memory: 8K words (Flash) Data Memory (RAM): 368 bytes EEPROM Data Memory: 256 bytes I/O Features Up to 33 programmable I/O pins Multiple input/output ports (PORTA, PORTB, PORTC, PORTD, PORTE) High current sink/source capability on selected pins Analog Features 10-bit Analog-to-Digital Converter (ADC) Up to 8 analog input channels Programmable voltage reference Timers and Control Three timers (Timer0, Timer1, Timer2) Capture/Compare/PWM (CCP) modules Watchdog Timer (WDT) Power-on Reset (POR) and Brown-out Reset (BOR) Communication Interfaces USART (Universal Synchronous/Asynchronous Receiver/Transmitter) SPI (Serial Peripheral Interface) I²C (Inter-Integrated Circuit) via MSSP module Electrical Characteristics Operating Voltage: 4.0V to 5.5V Operating Temperature Range: -40°C to +85°C (Industrial grade) Low power consumption modes available Package Information Package Type: PDIP (Plastic Dual Inline Package) Pin Count: 40 pins Mounting Type: Through-hole Applications Industrial control systems Embedded automation Consumer electronics Sensor interfacing and data acquisition Educational and prototyping platforms #commonpartslibrary #integratedcircuit #microcontroller

    Properties

    Microcontroller

    Microchip Technology

    PIC16F877A-I/P

    microchip.com/downloads/en/DeviceDoc/39582C.pdf

    U

    creativecommons.org/licenses/by/4.0/

    parametric-v1

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