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A prescaler is a circuit that generates an output signal related to an input signal by a fractional scale factor.
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The prescaler is a 3-bit value stored in the three least significant bits of the Timer / Counter register: CS02, CS01, and CS00.
TC_Chu's Point 2009
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Analog Devices, Inc. (ADI), a global leader in high-performance semiconductors for signal-processing applications and leading provider of RF ICs (radio frequency integrated circuits), announced today the availability of new RF prescaler circuits for a variety of applications, including point-to-point radios, VSATs (very small aperture terminals) and microwave communication systems.
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This launch of the ADF500x series of products includes three new devices: the ADF5000 divide-by-2 prescaler;
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The only configuration to be done on the clock signal is to set the prescaler to the bus clock.
Recently Uploaded Slideshows Flashdomain 2010
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ADF500x RF prescaler circuits operate up to 18 GHz with very low power consumption.
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The latest generic FPGA logic components includes a PWM with an 8-bit input and a prescaler setting.
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Assuming you are using an Atmega168 with the Arduino Diecimila bootloader burned on it (which is exactly what you are using if you bought an Arduino Diecimila), this counter's clock is equal to the sytem clock divided by a prescaler value.
TC_Chu's Point 2009
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Since we chose to use a prescaler of 1: 8 for the Timer2 clock input, a count of 2 indicates that the prologue to the interrupt service routines occupies (at least) 16 clock cycles, equivalent to the execution of 16 instructions.
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Then we can initialize T1CON so that the timer will operate in a simple configuration, where: ● Timer1 is activated: TON = 1 ● The main MCU clock serves as the source (Fpb): TCS = 0 ● The prescaler is set to the maximum value (1: 256): TCKPS
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