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HP 20b 刷机接口引脚定义 - 版本历史
2026-04-04T15:10:04Z
本wiki上该页面的版本历史
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Dousha99：typo
2016-08-27T15:19:06Z
<p>typo</p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">2016年8月27日 (六) 15:19的版本</td>
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Dousha99
https://calcwiki.org/index.php?title=HP_20b_%E5%88%B7%E6%9C%BA%E6%8E%A5%E5%8F%A3%E5%BC%95%E8%84%9A%E5%AE%9A%E4%B9%89&diff=7963&oldid=prev
Dousha99：初始化本页面
2016-07-23T04:24:45Z
<p>初始化本页面</p>
<p><b>新页面</b></p><div>[[File:34s-conn.jpg|有框|右|刷机接口]]<br />
<br />
该引脚定义为官方给出的引脚定义。<br />
<br />
{|class=wikitable<br />
| '''引脚编号'''<br />
| '''引脚名称'''<br />
| '''引脚定义'''<br />
|+<br />
| J31<br />
| Vcc<br />
| 3.3V 电源输出<br />
|-<br />
| J32<br />
| Reset<br />
| 重置<br />
|-<br />
| J33<br />
| Tx0<br />
| 串口发送端<br />
|-<br />
| J34<br />
| Gnd<br />
| 接地<br />
|-<br />
| J35<br />
| Rx0<br />
| 串口接收端<br />
|-<br />
| J36<br />
| Erase<br />
| 擦除<br />
|}<br />
<br />
== 备用引脚定义 ==<br />
<br />
如果在焊接原焊点时出现不可恢复的错误（如焊接点脱落），则依然可以使用备用焊点来进行刷机。但是需要注意到： Reset 引脚和 Erase 引脚'''没有备用引脚'''。<br />
<br />
{|class=wikitable<br />
| '''原引脚'''<br />
| '''备用引脚'''<br />
|+<br />
| J31<br />
| LB1 右侧<br />
|-<br />
| J33<br />
| JP5 右侧<br />
|-<br />
| J35<br />
| JP6 右侧<br />
|-<br />
| J34<br />
| C21 上端<br />
|}</div>
Dousha99