第八章ad轉(zhuǎn)換模塊-在線瀏覽
2024-09-11 13:22本頁(yè)面
【正文】 應(yīng)用 ?單通道，單次轉(zhuǎn)換 ?多通道，單次轉(zhuǎn)換 ?單通道，序列轉(zhuǎn)換模式 ?多通道，序列轉(zhuǎn)換模式 ?特殊通道測(cè)試模式 ADC 工作方式 27 單片機(jī)原理與應(yīng)用 ATD Registers 7/12 ATD Status Register 0 (ATDSTAT0) SCF Sequence Complete Flag 0=Conversion sequence not pleted 1=Conversion sequence has pleted ETORF External Trigger Overrun Flag 0=No External trigger over run error has occurred 1=External trigger over run error has occurred FIFOR Result Register Over Run Flag 0=No over run has occurred 1=Overrun condition exists (result register has been written while associated CCFx flag was still set) CC[3:0] Conversion Counter 當(dāng)前轉(zhuǎn)換結(jié)果將寫(xiě)入的結(jié)果寄存器編號(hào) 例如： CC[3:0]=0110， 轉(zhuǎn)換結(jié)果寫(xiě)入第 6個(gè)結(jié)果寄存器 先入先出模式下，不被初始化，當(dāng)計(jì)數(shù)到最大值回最小值 非先入先出模式下，轉(zhuǎn)換開(kāi)始和結(jié)束時(shí)被初始化為 0 兩種模式下終止 ATD轉(zhuǎn)換或開(kāi)始新 ATD轉(zhuǎn)換均被清零 28 單片機(jī)原理與應(yīng)用 ATD Registers 8/12 ATD Compare Enable Register (ATDCMPE) CMPE[15:0] Compare Enable for Conversion Number n (n= 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) of a Sequence 0=No automatic pare 1= Automatic pare of results for conversion n of a sequence is enabled 對(duì)一個(gè)序列中第 n次 ATD轉(zhuǎn)換結(jié)果進(jìn)行比較，除 CMPE[n]=1，還要完成如下設(shè)置： ① 將比較閾值寫(xiě)入 ATDDRn ② 寫(xiě) ATDCPMHT的 CMPHT[n]位選擇比較方法 注：寫(xiě) ATDCMPE會(huì)終止當(dāng)前轉(zhuǎn)換序列 29 單片機(jī)原理與應(yīng)用 ATD Registers 9/12 ATD Status Register 2 (ATDSTAT2) CCF[15:0] Conversion Complete Flag n (n= 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) 0=Conversion number n not pleted or successfully pared 1=If (CMPE[n]=0): Conversion number n has pleted. Result is ready in ATDDRn. If (CMPE[n]=1): Compare for conversion result number n with pare value in ATDDRn, using pare operator CMPGT[n] is true. (No result available in ATDDRn) 出現(xiàn)以下任一情況， CCF[n]被清零： ① 寫(xiě) ATDCTL5 ② 當(dāng) AFFC=0，向 CCF[n]寫(xiě) 1 ③ 當(dāng) AFFC=1，且 CMPE[n]=1，寫(xiě) ATDDRn 30 單片機(jī)原理與應(yīng)用 ATD Registers 10/12 ATD Input Enable Register (ATDDIEN) IEN[15:0] ATD Digital Input Enable on channel x (x= 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) 0=Disable digital input buffer to ANx pin 1=Enable digital input buffer on ANx pin 通用 I/O口 AD口與 ATD模塊的模擬輸入引腳復(fù)用 將某個(gè)模擬輸入引腳作為通用輸入
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