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我想要透過CCS讀取外部訊號，我已成功讀取內部測試方波如下圖一，但是當我將暫存器改為讀取外部訊號80HZ SIN波，數據輸出圖如二，請問是什麼原因造成這個結果，我需要如何改進?圖三為外部測試訊號在示波器上呈現之結果。
圖一
圖2
圖3
