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ST72E331 数据表(PDF) 83 Page - STMicroelectronics |
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ST72E331 数据表(HTML) 83 Page - STMicroelectronics |
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83 / 107 page  83/107 ST72E331 ST72T331 5.7 8-BIT A/D CONVERTER (ADC) 5.7.1 Introduction The on-chip Analog to Digital Converter (ADC) pe- ripheral is a 8-bit, successive approximation con- verter with internal sample and hold circuitry. This peripheral has up to 8 multiplexed analog input channels (refer to device pin out description) that allow the peripheral to convert the analog voltage levels from up to 8 different sources. The result of the conversion is stored in a 8-bit Data Register. The A/D converter is controlled through a Control/Status Register. 5.7.2 Main Features s 8-bit conversion s Up to 8 channels with multiplexed input s Linear successive approximation s Data register (DR) which contains the results s Conversion complete status flag s On/Off bit (to reduce consumption) The block diagram is shown in Figure 1. Figure 46. ADC Block Diagram SAMPLE ANALOG MUX AIN0 AIN1 AIN2 AIN3 AIN4 AIN5 AIN6 AIN7 (Control Status Register) CSR (Data Register) DR & HOLD fCPU ANALOG TO DIGITAL CONVERTER COCO 0CH0 CH1 CH2 - -ADON AD7 AD4 AD0 AD1 AD2 AD3 AD6 AD5 83 |
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