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A prescaler is an electronic counting circuit used to reduce a high frequency electrical signal to a lower frequency by integer division. The prescaler takes the basic timer clock frequency (which may be the CPU clock frequency or may be some higher or lower frequency) and divides it by some value before feeding it to the timer, according to how the prescaler register(s) are configured. The prescaler values, referred to as prescales, that may be configured might be limited to a few fixed values (powers of 2), or they may be any integer value from 1 to 2^P, where P is the number of prescaler bits.
The purpose of the prescaler is to allow the timer to be clocked at the rate a user desires. For shorter (8 and 16-bit) timers, there will often be a tradeoff between resolution (high resolution requires a high clock rate) and range (high clock rates cause the timer to overflow more quickly). For example, one cannot (without some tricks) achieve 1 μs resolution and a 1 sec maximum period using a 16-bit timer. In this example using 1 μs resolution would limit the period to about 65ms maximum. However the prescaler allows tweaking the ratio between resolution and maximum period to achieve a desired effect.
prescaler is an electronic counting circuit used to reduce a high frequency electrical signal to a lower frequency by integer division. The prescaler...
called a prescaler which reduces the frequency to a manageable level. Since the prescaler is part of the overall division ratio, a fixed prescaler can cause...
A frequency divider, also called a clock divider or scaler or prescaler, is a circuit that takes an input signal of a frequency, f i n {\displaystyle...
simplest of these. Early applications of ring counters were as frequency prescalers (e.g. for Geiger counter and such instruments), as counters to count pattern...
For very high (microwave) frequencies, many designs use a high-speed prescaler to bring the signal frequency down to a point where normal digital circuitry...
Some AVRs also have a system clock prescaler that can divide down the system clock by up to 1024. This prescaler can be reconfigured by software during...
power detectors and logarithmic amplifiers; PLL and DDS synthesizers; RF prescalers; variable gain amplifiers; ADC drivers, gain blocks, LNAs and other RF...
internal clock frequency of the 8279 is nominally 100 kHz. An internal prescaler divides an externally applied clock by an integer between 2 and 31 (both...
step attenuators (DSAs), phase locked-loop (PLL) frequency synthesizers, prescalers, mixers/upconverters, and variable-gain amplifiers. These RFICs are designed...
cathodes. These were used as self-displaying divide-by-n counter/timer/prescalers in counting instruments, or as adder/subtracters in calculators. In 1930s...
available on individual pins for displaying, divide-by-n counter/timer/prescalers, etc. T – Relay triode, a low-power triode thyratron, one starter electrode...
8 MHz speeds. Alternatively, this may be accomplished by changing the CPU prescaler in the application code. ATmega169V AVR 8-bit CPU, including 16 Kbyte...
(January 2014) Version 14* - Other platforms now installed as plugins, PRESCALER, improved debugging (August 2015) *skipped v13 Version 14 - Update: introduces...
perpendicular to the spin axis of the satellite. The detectors fed through prescalers and log rate meters to 16 analog telemetry channels. Counts were accumulated...
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