High Frequency Processor

You'll first check for pwm pulses of suitable frequency and pulse width at processor output. I see a number of circuit faults: - using high side instead of low side driver channel without a reason - resistor values R1, R5, R6 inappropriate - D4 reversed Without annotation of all supply voltages, e.g. Va, the circuit isn't readable.

thanks for the comment slutarius. in fact I want to test my pcb, I am not sure that my pcb works correctly at high frequency. do have any idea? So the issue is different from what you started. I have nothing to say about PCB here. Sorry.

Yes, We should help you by guessing your code ? Zip and post the complete project files and mention which compiler you are using and what is the clock frequency. Flame sensor modules from ebay give a digital out. It either gives low or high when flame (IR) is detected. You have to connect flame sensor output to INT0 pin and write external interrupt

What is the MINIMUM frequency? If it's close to DC, your transformer approach won't work, and you'll have to look at using a high-voltage amplifier. But assuming you can use a transformer and don't want to use a processor, you could use a digital potentiometer to set your voltage level. They make simple, pushbutton-controlled digital pots. (...)

When you are taking about micro controller u need check the max handling capability of the device... What is ur application?It seems your application is not for high speed and using 400MHz will be over design.Select the adc based on ur application and processor interface from adc...

Duty cycles can be measured with input capture unit by determing both low and high period, but only within the timing resolution given by the processor clock. Duty cycle infomation at 1 MHz will be respectivly coarse. Outputs of ATmega are exclusively digital (0/1), so I wonder how you want to output the duty cycle by a single pin?

In an MPU with a supply voltage range of 3.3 to 5 volts I want to use the output of a switch mode chip that has a ripple of about a volt within that range to provide the supply voltage. Datasheets are silent on the allowable ripple, both magnitude & frequency. Texas Instruments says that's not a parameter they quote. Any ideas on deciding the allow

It should make the writeable ins of PORT A all go high and stay high. I suspect the problem isn't in the code you posted but in the configuration fuses. You haven't given us any information on what they are set to. Also bear in mind that if you are simply swapping one processor for the other, the maximum clock frequency (...)

Mostly temperature rise. Maximum power is dissipated while switching, the higher the frequency, the more power used. Called switching loses. high speed processors like the Arm have low core voltages to reduce the power dissipated while switching.

Reading some book on "PCB design on high frequency" may be helpful to you. Just search it in this forum.

Normally, many processor architectures use this method to double the input clock. For this design, PCB may supply the low clock, and core can run with high clock. welcome to discuss this point.

Hi, Yes this is enough, the frequency on this output is not a very high. But if you want to measure the speed of fan, the better choice is using the internal timer as counter, and count this impulse for the fixed period. In this case you no need to dating every impulse.