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當Uart Rx與nRESET共用腳位時,如何設定成Uart Rx功能? 日期:2019-10-02
以MS51DA9AE為例,在上電後,P2.0可以設定為input-only或者nRESET兩種功能,P2.0預設功能為nRESET。在P2.0設定為input-only狀態下,才可以透過程式切換P2.0的功能。以Uart Rx為例,需依循以下步驟:
1. 利用ICP工具將MS51DA9AE的RPD (CONFIG0.2) 設為0,目的是將0設為input-only模式。
2. 移除Reset相關電路,目的是怕IO驅動能力不足而無法將有上拉電阻的腳位往下拉。
產品: | 微控制器 ,8 位元 8051 微控制器 |
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應用: | |
功能: | Peripherals,I/O,GPIO |