---
title: "W7500P-SE2 clock 8MHz or 12MHz"
url: "https://maker.wiznet.io/forum/14915"
markdown_url: "https://maker.wiznet.io/forum/14915/md"
type: "Forum topic"
category: "Serial-to-Ethernet & ConfigTool"
author: "ja sws"
created: "2023-05-17T00:26:18+09:00"
last_activity: "2023-05-23T00:04:24+09:00"
language: "en"
views: 234
replies: 3
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# W7500P-SE2 clock 8MHz or 12MHz

## Question

Asked by ja sws on 2023-05-17 in Serial-to-Ethernet & ConfigTool.

What is the correct external crystal frequency to use with W7500P-SE2 firmware?
One reference design shows 8MHz but another one shows 12MHz.

## Replies

### Reply 1 by lawrence, 2023-05-19

W7500P has 8MHz internal OSC. and it recommends 8~24MHz external OSC or Crystals. Both are correct you can choose those crystal.

### Reply 2 by ja sws, 2023-05-19 (in reply to reply 1)

Thank you for confirming. Just to make sure does that mean that the SE2 firmware work OK with any clock speed in the range 8~24MHz without need to change settings? In case we purchase the W7500P-SE2 version device with firmware already programmed then it will work OK with any clock speed in that range.

### Reply 3 by lawrence, 2023-05-23

probably, it has 8MHz OSC, you can check your program with it and make your own hardware. If you want, we can double check your own hardware schematic too.

---

Source: https://maker.wiznet.io/forum/14915