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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16F882-I датащи(PDF) 85 Page - Microchip Technology |
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PIC16F882-I датащи(HTML) 85 Page - Microchip Technology |
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85 / 328 page  © 2009 Microchip Technology Inc. DS41291F-page 83 PIC16F882/883/884/886/887 8.0 COMPARATOR MODULE Comparators are used to interface analog circuits to a digital circuit by comparing two analog voltages and providing a digital indication of their relative magnitudes. The comparators are very useful mixed signal building blocks because they provide analog functionality independent of the program execution. The analog comparator module includes the following features: • Independent comparator control • Programmable input selection • Comparator output is available internally/externally • Programmable output polarity • Interrupt-on-change • Wake-up from Sleep •PWM shutdown • Timer1 gate (count enable) • Output synchronization to Timer1 clock input •SR Latch • Programmable and fixed voltage reference 8.1 Comparator Overview A single comparator is shown in Figure 8-1 along with the relationship between the analog input levels and the digital output. When the analog voltage at VIN+ is less than the analog voltage at VIN-, the output of the comparator is a digital low level. When the analog voltage at VIN+ is greater than the analog voltage at VIN-, the output of the comparator is a digital high level. FIGURE 8-1: SINGLE COMPARATOR Note: Only Comparator C2 can be linked to Timer1. – + VIN+ VIN- Output Output VIN+ VIN- Note: The black areas of the output of the comparator represents the uncertainty due to input offsets and response time. |
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