Datasheet 18F – Ebook download as PDF File .pdf), Text File .txt) or read book online. PDA. View Full Version: 18F Quaduature Encoder This change will be notified in a datasheet’s () future update. PIC18FI/P Microchip Technology 8-bit Microcontrollers – MCU 16KB RAM 34 I/O datasheet, inventory, & pricing.

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Any help with the set up code would be appreciated. Thank you datashest advance. Hi, This works for me on 18F, should be the same. This ‘is prevented by reading the high byte two times and compare the two readings. Great tip on counter overflow. I will definately incorporate. Isn’t that an awesome controller?

On the pin version, forget using RE3 as an input. I tried, and submitted a support ticket to Microchip. This change will be notified in a datasheet’s DSB. It sure is a cool device. Using Daasheet interupt routines I managed to get motor controller for my robot working, with PID filter and all.

I never managed to get QEI module going in velocity mode. I made a few attempts to begin with but could never quite figure it out so I went for my own velocity calcs newPos-oldPos.

PWM Glitch on the 18F, 18F, 18F, and 18F for very low duty cycles | Microchip

It has a CD that conatins source code in assembly. I was wondering if someone has done same thing in pic basic i. I tried according to application note but to no avail. Here is my code. I wish I could help but I am using the 18F in a completely different manner. I don’t have the 18F or Microchip motor dagasheet board, but this works on the 18F Ramps up, then down. It should be at least datadheet to get you started. To work with the 18F Not yet at least.

I’m using dayasheet 18F too. It’s a great uC! The Quadrature-Encoder isn’t very strange Yeah this one is a nifty series PIC for sure. See this post http: Now, if I can just find more time to play with it. Thanks a lot Bruce. Thanks for your code although its in assembly. MOVFF is move file to file.


Bruce, That’s a super start to a beginner like me.

PWM Glitch on the 18F2331, 18F2431, 18F4331, and 18F4431 for very low duty cycles

But,i gotta some problem with the PWM Period value. 188f4431 mean how to find the values for. How to find this using equation i use this equ since it’s free running mode here. Could you guide me how to do this. I am a bit confused. The rest seems yeeha as it’s taught in ” MTR” from Microchip. Subtract 1 for If you load into the period register, it will generate a PWM frequency of around Now you adtasheet to know the PWM resolution to know the range of duty cycle bits.

Resolution is the number of bits you have to control the duty cycle. Not the PWM frequency.

For PWM resolution use the equation below. Equation ‘as shown in the data sheet’ doesn’t produce the same figures for PWM resolution shown in Table I haven’t played much with this particular feature.


Hi Bruce, Sorry if i pester you a lot. Well,it drive me crazy to know about it. This should be more than enough for me to get started.

This is part of it and not complete yet. But anyhow,it’s clear enough for me to understand. I mean it’s really worth to understand this special function micro which i will face the App soon or later.

First is the same thing that should be first for every new pic, can you blink a led? I know this seems so simple, but it really does ensure you have a few needed things correct before making things more complicated.

I use the “Hello World” out the serial port test. That not only tells me that the program is running, but also that the frequency is correct – something that a blinking LED doesn’t do very well.

While Bert’s statement might sound like just so much talk to some I vouch for his opinion especially if you are moving to 18F chips for the first few times, I had an amazingly difficult time just getting this chip to blink the LED, owing to programmer issues, 1f4431 issues. That said, there still seems to be a bit of mystery surrounding it’s use, 18t4431 least to me. I mapped out datashdet formulas in Excel, but I am still having trouble getting my dstasheet around the details.


I’m trying to make a generic Dztasheet for low frequencies and keep running into the wall. An 18F with two pots, a switch, and the FETs with drivers. One Pot is for Frequency, the other is for Duty. The switch controls if the output is pulsed DC or cycles both ways. I’m not understanding the interaction of the frequency to the Duty.

I can control the Freq just fine, datssheet it makes a mess of the duty. I can see that there is a dependency with the PWM resolution, but I’m not sure how to manage it.

CCS :: View topic – Can’t setup_spi2(mode) for Pic18f ?

Copyright c Controlled Surroundings Inc. Basically the module is counter and two comparators.

When the counter starts at 0 the output is set, when it “hits” the value of the first comparator the outputs is cleared and when the counter “hits” the value of the second compartor the PWM cycle starts over.

Thanks for the explanation Henrik. The more we pound on this and post the results, the better we can get a handle on it. That concept started to peek through the fog eventually. The fact that my frequency and duty had to be changeable made it a bit more confusing for me.

I don’t fully understand how to plan for it, but I did figure out a relationship in my application and kind of applied a brute force solution.

18f431 I ended up with was this: LowByte hserout [“D”,dec duty,”F”,dec Freq] goto Main ‘ Loop end Like I said, I’m going to have to study my own work just to understand it better, but at least it works like it is suppose to. That was a few weeks of hair pulling!. Beat your head long enough against the wall, and sometimes you find a door.: