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A frequency divider, also called a clock divider or scaler or prescaler, is a circuit that takes an input signal of a frequency, , and generates an output signal of a frequency: f o u t = f i n N {\displaystyle f_{out}={\frac {f_{in}}{N}}}
The AY-3-8910 generates tones with fundamental frequencies of up to 125 kHz (4 MHz input clock, or 6 MHz with the YM2149F), well beyond human hearing range and into the ultrasonic range. The existence of ultrasonic values is a consequence of the frequency-divider design; in order to have adequate resolution at audible frequencies it is ...
In some configurations, the phase output is taken from the output of the register which introduces a one clock cycle latency but allows the adder to operate at a higher clock rate. [2] Figure 2: Normalized phase accumulator output. The adder is designed to overflow when the sum of the absolute value of its operands exceeds its capacity (2 N − ...
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.
octal divide-by-2 clock driver, 2 outputs inverted 16 SN74AS303: 74x304 1 octal divide-by-2 clock driver 16 SN74AS304: 74x305 1 octal divide-by-2 clock driver, 4 outputs inverted 16 SN74AS305: 74x306 1 8-bit LV-TTL to GTL+ bus transceiver three-state and open-collector (24) SN74GTLPH306: 74x309 1 1024-bit RAM (1024x1) open-collector 16 SN74S309 ...
LFSR counters have simpler feedback logic than natural binary counters or Gray-code counters, and therefore can operate at higher clock rates. However, it is necessary to ensure that the LFSR never enters a lockup state (all zeros for a XOR based LFSR, and all ones for a XNOR based LFSR), for example by presetting it at start-up to any other ...
A workaround is put the external clock signal into the D input of a 74ACT74 flip-flop, run the flop's Q output to the 6522's CB1 pin, and clock the flip-flop with ϕ0 or ϕ2. [ 4 ] The serial shift register bug was corrected in the California Micro Devices CMD G65SC22 [ citation needed ] and in the MOS 6526 , the latter device which Commodore ...
The generator may have additional sections to modify the basic signal. The 8088 for example, used a 2/3 duty cycle clock, which required the clock generator to incorporate logic to convert the 50/50 duty cycle which is typical of raw oscillators. Other such optional sections include frequency divider or clock multiplier sections. Programmable ...