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PIC16F877ATI/ML 数据表(PDF) 134 Page - Microchip Technology |
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PIC16F877ATI/ML 数据表(HTML) 134 Page - Microchip Technology |
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134 / 234 page  PIC16F87XA DS39582B-page 132 2003 Microchip Technology Inc. 11.4 A/D Conversions Clearing the GO/DONE bit during a conversion will abort the current conversion. The A/D Result register pair will NOT be updated with the partially completed A/D conversion sample. That is, the ADRESH:ADRESL registers will continue to contain the value of the last completed conversion (or the last value written to the ADRESH:ADRESL registers). After the A/D conversion is aborted, the next acquisition on the selected channel is automatically started. The GO/DONE bit can then be set to start the conversion. In Figure 11-3, after the GO bit is set, the first time segment has a minimum of TCY and a maximum of TAD. FIGURE 11-3: A/D CONVERSION TAD CYCLES 11.4.1 A/D RESULT REGISTERS The ADRESH:ADRESL register pair is the location where the 10-bit A/D result is loaded at the completion of the A/D conversion. This register pair is 16 bits wide. The A/D module gives the flexibility to left or right justify the 10-bit result in the 16-bit result register. The A/D Format Select bit (ADFM) controls this justification. Figure 11-4 shows the operation of the A/D result justification. The extra bits are loaded with ‘0’s. When an A/D result will not overwrite these locations (A/D dis- able), these registers may be used as two general purpose 8-bit registers. FIGURE 11-4: A/D RESULT JUSTIFICATION Note: The GO/DONE bit should NOT be set in the same instruction that turns on the A/D. TAD1 TAD2 TAD3 TAD4 TAD5 TAD6 TAD7 TAD8 TAD9 Set GO bit Holding capacitor is disconnected from analog input (typically 100 ns) b9 b8 b7 b6 b5 b4 b3 b2 TAD10 TAD11 b1 b0 TCY to TAD Conversion starts ADRES is loaded GO bit is cleared ADIF bit is set Holding capacitor is connected to analog input 10-bit Result ADRESH ADRESL 0000 00 ADFM = 0 0 2 1 0 7 7 10-bit Result ADRESH ADRESL 10-bit Result 0000 00 7 0 7 6 5 0 ADFM = 1 Right Justified Left Justified |
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