August 02, 2025

AVR microcontroller parallel port ISP download line circuit schematic

Single chip microcomputer STM32L151CCU6
1206RGB (single)
0201 package SLP0603 ESD electrostatic diode 5V one-way ESD
Imported spot passive patch crystal oscillator 3225 2520 40.000MHZ
SMD aluminum electrolytic capacitor

For AVR microcontroller enthusiasts, especially college students looking to build their own ISP programming lines, this guide provides a simple and effective solution. With just one line, you can develop all types of AVR microcontrollers. Two mature circuit designs are available for DIY projects, making it easy to get started. It's crucial to ensure that the wiring and power connections are correct to avoid damaging the components. Some boards in the SL-DIY series come with an ISP parallel port download cable, offering flexibility for different setups.
Figure 1: The simplest ISP parallel port download line schematic.


Figure 2: Standard parallel port ISP download socket wiring function diagram.


Figure 3: Parallel download line schematic with signal isolation.

These diagrams help users understand the layout and functionality of each design. Whether you're new to electronics or an experienced maker, these resources will assist in building a reliable ISP programming interface.

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