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I want to divide the input clock frequency provided by my Spartan3-xc3s200 by 2. I used the DCM to do that. I do not know why do they give me the CLK0 output since I do not want to use it anymore. I want to use the CLKDV output. Is it possible to leave it unconnected ? obr
Timer2 sets the overall PWM frequency. The prescaler bits divide the system clock before it reaches Timer2 to allow you a wider range of possible frequencies. As far as I know, the postscaler bits are not used in PWM generation. Brian.
You can use XMega parts with big success. PIC controllers divide the clock on 4 to execute instructions (so 20 MHz clock results in 5 MIPS performance) where AVR parts use directly the clock - 20 MHZ results in 20 MIPS. So even smaller AVR controllers like ATMEGA88 which run on 20 MHz can outperform the PIC18F252. AVR timers (...)
I am using Kintex7 with Vivado 2014.4. I want to have a divided by 8 clock using clocking wizard ( MMCM, PLL ) from input 33Mhz clock. Vivado keeps saying I can not generated a clock slower than 6.xx Mhz ( xx is a number which I can not remember now ). What is the point here ? Do I need to use (...)
If you don't know how to create a 1 second signal, you've got big problems. But here's how to to do it: divide your clock by the number equal to the frequency. In other words, if you've got a 1MHz clock, divide it by 1 million.
Hi, a) you can have internal or external clock sources. Some microcontrollers can slo down (divide) the clock, some microcontrollers have an internal PLL to create higher or lower clock. a, b, c) To start with it and to get a solid idea of what a microcontroller can do and how it works.... * read some datasheets. You (...)
hey guys, which is better way to divide the clock either using pll(ip's) or writing code algorithm. when to use pll? when to use algorithm?
Hi All, How clock domains should be defined? Let's say, should the source and divided by 2 clocks be defined as the same clock domain? What's about a clock divider by 3/5, etc? What are the rules for clock domain definitions? Thank you!
Hello! There is no miracle. If you divide your 16 MHz clock by 200 kHz, you can have timer periods of 80. Therefore you have some 1.25% steps. If you need 0.01% (i.e. timer value of 10000) and 200 kHz, then you need something with a clock at 2 GHz. Or you can look at TI's C28 series where you have a PWM resolution of 150 ps. Dora.
I have a 25 MHz but need 10 MHz, will you please let me know how to write the verilog code for divide by 2.5. This is what I have done, but not sure if it will work. I have divide by 5 and multiple by 2. always @(posedge CLK_OSC or posedge RST) if (RST) count<=0; else if (count == 3'd4) count<=0; else count <=count
why we divide crystal frequency by 12 for 8051 timer..
1 cycle =1000000 / in ?S FOSC can be internal (inside the PIC) or external , use of a Quartz or an external clock device generator. for Other PIC18F you can active a PLL multiplicator => FOSC*4 => 1 cycle= 1000000/ FOSC ?S for executime time Code operation take mainly 1 cycle ( it's explain why we divide FOSC/4) but some
Hi, In my opinion the approach to follow depends on your design complexity. I presume you can view your simulation via waveforms. 1> For simple designs look at the CLK signal when the simulation ends. Note the time indicated by the cursor for the CLK signal. divide this time by 1 CLK period to get the no. of clk cycles. Sarath666 already mentioned
I would not recommend the usage of a 555 IC, because to charge a capacitor in exactly 1 hour is almost impossible because of temperature, component tolerances and ambient noise. I recommend the usage of a 'high' frequency clock and then to divide it. Another option is to use a MCU.
Rather than guess on a implementation solution without defining the real task, Define the real purpose, then what you tried and then ask for suggestions. i.e is this to synthesize a clock with a binary controlled range of sweep frequencies using 1 to 256 divide ratios then sweep frequencies with a fixed pulse width then sweep duty cycles while sw
Well show us some of those ideas you've got right now. Once we've seen where you are at we can make suggestions or help clear up stuff you may not quite have right. To give you something to mull over if you have no clue where to start... At the most basic level you'll need a counter to divide down your clock to something slow enough that you can s
Hi everybody, I'm an Electrical and Electronics Engineering student. For my term project I need to implement an FPGA design which uses VGA interface. Xilinx XSA 3S1000 board has a 100 MHz fixed clock frequency and I need to change that to 25 MHz. Our instructors and FPGA board datasheet are not helpful. Datasheet say that I need to program CP
Hi everyone, I have an assignment to do i.e, 8 LEDs blinking one after the other on Spartan 3E board. The pattern for LEDs should be started from right most LED and continue to the left one. after one round completion it should again be started from right. I know the basics to divide clock, the question is do i need 8 different clocks to (...)
PLL generates new clock by multiplying reference xN by an Integer counter / N in the feedback loop to the mixer. Thus clk_4x is the VCO output which drives /4 counter to mix at 1x phase detector and vco/2 counter out to get clk_2x However to get a 3 phase output requires a divide by 3 counter with 3 gate combinations to generate each phase at 1
I've been looking at the figures in the Dallas ds89c450 User Guide, like figure 11-2 "Timers/Counters 0 and 1, Mode 2". I'm trying to figure out how the figure of divide by 3072 is obtained for the input clock to Timer 1. With CD1 / CD0 both 1, the micro is in Power Management Mode. So, the system clock is divided by (...)