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In one-shot mode the comparator fires an interrupt once when the main counter reaches the value stored in the comparator's register, while in the periodic mode the interrupts are generated at specified intervals. Comparators can be driven by the operating system, e.g. to provide one timer per CPU for scheduling, or by applications.
The full operation of a simple sorting network is shown below. It is evident why this sorting network will correctly sort the inputs; note that the first four comparators will "sink" the largest value to the bottom and "float" the smallest value to the top. The final comparator sorts out the middle two wires.
By only strobing a comparator at certain intervals, higher accuracy and lower power can be achieved with a clocked (or dynamic) comparator structure, also called a latched comparator. Often latched comparators employ strong positive feedback for a "regeneration phase" when a clock is high, and have a "reset phase" when the clock is low. [ 33 ]
Trigger comparator: The comparator's positive input is connected to voltage divider's lower reference, and the comparator's negative input is connected to TRIGGER. Latch: A set-reset latch stores the state of the timer and is controlled by the two comparators. RESET overrides the other two inputs, thus the latch (and therefore the entire timer ...
8-bit comparator, inverting output 20 kΩ pull-up open-collector 20 SN74ALS522: 74x524 1 8-bit registered comparator open-collector 20 74F524: 74x525 1 16-bit programmable counter 28 74F525: 74x526 1 fuse programmable identity comparator, 16-bit 20 SN74ALS526: 74x527 1 fuse programmable identity comparator, 8-bit + 4-bit conventional Identity ...
Timers column - more recent families have wider timers and may allow chaining two 16-bit timers to do 32-bit capture. RTT is a 16-bit Real Time Timer that is driven by a 32.768KHz clock, though Microchip calls it RTC for Real Time Counter (easily confused to mean Real Time Clock).
In computational complexity theory, CC (Comparator Circuits) is the complexity class containing decision problems which can be solved by comparator circuits of polynomial size. Comparator circuits are sorting networks in which each comparator gate is directed, each wire is initialized with an input variable, its negation, or a constant, and one ...
The comparator output drives the second common collector stage Q2 (an emitter follower) through the voltage divider R 1-R 2. The emitter-coupled transistors Q1 and Q2 actually compose an electronic double throw switch that switches over the upper legs of the voltage divider and changes the threshold in a different (to the input voltage) direction.