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当Uart Rx与nRESET共享脚位时,如何设定成Uart Rx功能? 日期:2019-10-02
以MS51DA9AE为例,在上电后,P2.0可以设定为input-only或者nRESET两种功能,P2.0默认功能为nRESET。在P2.0设定为input-only状态下,才可以透过程序切换P2.0的功能。以Uart Rx为例,需依循以下步骤:
1. 利用 ICP 工具将 MS51DA9AE的RPD (CONFIG0.2) 设为 0,目的是将 P2.0 设为 input-only 模式。
2. 移除 Reset 相关电路,目的是怕 IO 驱动能力不足而无法将有上拉电阻的脚位往下拉。
产品: | 微控制器 ,8 位 8051 微控制器 |
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应用: | |
功能: | Peripherals,I/O,GPIO |