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C8051F360 Datasheet(PDF) 61 Page - Silicon Laboratories |
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C8051F360 Datasheet(HTML) 61 Page - Silicon Laboratories |
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61 / 288 page  Rev. 1.0 61 C8051F360/1/2/3/4/5/6/7/8/9 5.4.2. Window Detector In Differential Mode Figure 5.8 shows two example window comparisons for right-justified, differential data, with ADC0LTH:ADC0LTL = 0x0040 (+64d) and ADC0GTH:ADC0GTH = 0xFFFF (-1d). In differential mode, the measurable voltage between the input pins is between -VREF and VREF*(511/512). Output codes are rep- resented as 10-bit 2’s complement signed integers. In the left example, an AD0WINT interrupt will be gen- erated if the ADC0 conversion word (ADC0H:ADC0L) is within the range defined by ADC0GTH:ADC0GTL and ADC0LTH:ADC0LTL (if 0xFFFF (-1d) < ADC0H:ADC0L < 0x0040 (64d)). In the right example, an AD0WINT interrupt will be generated if the ADC0 conversion word is outside of the range defined by the ADC0GT and ADC0LT registers (if ADC0H:ADC0L < 0xFFFF (-1d) or ADC0H:ADC0L > 0x0040 (+64d)). Figure 5.9 shows an example using left-justified data with the same comparison values. 0x01FF 0x0041 0x0040 0x003F 0x0000 0xFFFF 0xFFFE 0x0200 -VREF Input Voltage (Px.x - Px.x) VREF x (511/512) VREF x (64/512) VREF x (-1/512) 0x01FF 0x0041 0x0040 0x003F 0x0000 0xFFFF 0xFFFE 0x0200 -VREF Input Voltage (Px.x - Px.x) VREF x (511/512) VREF x (64/512) VREF x (-1/512) AD0WINT=1 AD0WINT not affected AD0WINT not affected ADC0LTH:ADC0LTL ADC0GTH:ADC0GTL AD0WINT not affected AD0WINT=1 AD0WINT=1 ADC0H:ADC0L ADC0H:ADC0L ADC0GTH:ADC0GTL ADC0LTH:ADC0LTL 0x7FC0 0x1040 0x1000 0x0FC0 0x0000 0xFFC0 0xFF80 0x8000 -VREF Input Voltage (Px.x - Px.y) VREF x (511/512) VREF x (64/512) VREF x (-1/512) 0x7FC0 0x1040 0x1000 0x0FC0 0x0000 0xFFC0 0xFF80 0x8000 -VREF Input Voltage (Px.x - Px.x) VREF x (511/512) VREF x (64/512) VREF x (-1/512) AD0WINT=1 AD0WINT not affected AD0WINT not affected ADC0LTH:ADC0LTL ADC0GTH:ADC0GTL AD0WINT not affected ADC0GTH:ADC0GTL AD0WINT=1 AD0WINT=1 ADC0H:ADC0L ADC0H:ADC0L ADC0LTH:ADC0LTL Figure 5.8. ADC Window Compare Example: Right-Justified Differential Data Figure 5.9. ADC Window Compare Example: Left-Justified Differential Data |
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