ATtinyX4 / ATtinyX5 pinout description and graphic diagram, with links and resources

ATtinyX4_X5_pinout

/* PINOUT DIAGRAMS FOR ATTINYX4 / ATTINYX5

                               ATtinyX4
                              .--------.
          VCC [2.7-5.5V] - 1 =| O      |= 14 - GND
       10(0),X1,PCI8,PB0 - 2 =|        |= 13 - 0(10),A0,PCI0,PA0
        9(1),X2,PCI9,PB1 - 3 =|        |= 12 - 1(9),A1,TXD,PCI1,PA1
  RESET,11(11),PCI11,PB3 - 4 =|        |= 11 - 2(8),A2,RXD,PCI2,PA2
     8(2),INT0,PCI10,PB2 - 5 <|        |= 10 - 3(7),A3,PCI3,PA3
        7(3),A7,PCI7,PA7 - 6 <|        |= 9  - 4(6),A4,SCK/SCL,PCI4,PA4
 6(4),A6,SDA/DI,PCI6,PA6 - 7 <|        |> 8  - 5(5),A5,DO,PCI5,PA5
                              '--------'

                               ATtinyX5
                              .--------.
     RESET,5,A0,PCI5,PB5 - 1 =| O      |= 8 - VCC [2.7-5.5V]
        3,A3,X1,PCI3,PB3 - 2 =|        |= 7 - 2,INT0,A1,SCK/SCL,PCI2,PB2
        4,A2,X2,PCI4,PB4 - 3 <|        |> 6 - 1,DO,RXD,PCI1,PB1
                     GND - 4 =|        |> 5 - 0,DI,TXD,SDA,PCI0,PB0
                              '--------'

    = - Pin
    > - PWM Pin
 4(6) - Arduino Pins, with CW(CCW) pinout (CCW on ATtinyX4 only)
 PCI - Pin Change Interrupt (PCINT) pins
 INT - External Interrupt pins
RESET - Reset Pin (fuses must be set to use)
DI/DO - Data In/Data Out (aka MOSI/MISO)
PA/PB - Port pins, Port A and Port B (PA on ATtinyX4 only)

Sourced from ATTinyCore by SpenceKonde
GitHub: https://github.com/SpenceKonde/ATTinyCore
ATtinyX4 Pinout: https://raw.githubusercontent.com/SpenceKonde/ATTinyCore/refs/heads/v2.0.0-devThis-is-the-head-submit-PRs-against-this/avr/extras/Pinout_x4.jpg
ATtinyX5 Pinout: https://raw.githubusercontent.com/SpenceKonde/ATTinyCore/refs/heads/v2.0.0-devThis-is-the-head-submit-PRs-against-this/avr/extras/Pinout_x5.jpg

Datasheets:
ATtinyX4: https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-7701_Automotive-Microcontrollers-ATtiny24-44-84_Datasheet.pdf
ATtniyX5: https://ww1.microchip.com/downloads/en/devicedoc/atmel-2586-avr-8-bit-microcontroller-attiny25-attiny45-attiny85_datasheet.pdf

AVR Fuse Calculator (for using RESET pin as I/O):
https://www.engbedded.com/fusecalc/

*/