---
title: "w5100+mega64 extended network and serial port transparent transmission"
url: "https://maker.wiznet.io/jaden/resellers/w5100-mega64-extended-network-and-serial-port-transparent-transmission/"
markdown_url: "https://maker.wiznet.io/jaden/resellers/w5100-mega64-extended-network-and-serial-port-transparent-transmission/md"
type: "VAR: Value-Added Reseller Products"
author: "patch1928"
author_url: "https://www.cirmall.com/circuit/647/"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "patch1928"
original_url: "https://www.cirmall.com/circuit/647/"
published: "2022-10-04"
language: "en"
hardware: ["WIZnet W5100"]
likes: 7
views: 1301
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# w5100+mega64 extended network and serial port transparent transmission

> S2E

Original author: patch1928 (source: https://www.cirmall.com/circuit/647/)

## Components

- **WIZnet W5100** x 1 ([docs](https://docs.wiznet.io/Product/Chip/Ethernet/W5100))

## Article

The mcu adopts the avr series mega64 of at company, and the network chip adopts the w5100 of South Korea's wiznet which contains the network protocol.

The mega64 uses a 7.3728mhz crystal as an external clock.

Its usart0 is extended to rs485

usart1 extended to rs232

Use spi interface to connect between w5100 and mega64. configured as100m bandwidth.

The power supply part uses mc34063 to provide system 3.3v power supply.

The hardware scheme block diagram is as follows:

![](https://www.cirmall.com/upload/images/Fm_qgLFOKOygW9BwIO6XqYsEnbT0/%E6%97%A0%E6%A0%87%E9%A2%98123456789.jpg)

Both drawings can be used normally

The picture below shows the test completed circuit board

![](https://www.cirmall.com/upload/images/FkNfZ9Nq6Zb5SOnxDzDww-bItr6c/123951jq38qahraa5qnvhg.jpg)

Attachments include:

The schematic is opened with altium, and the pcb is opened with pads2007.

---

Source: https://maker.wiznet.io/jaden/resellers/w5100-mega64-extended-network-and-serial-port-transparent-transmission/