Hi dazheng,
Need to know ... what is EEPROM used in MCU for ?. I know EEPROM stand for Electrical Erasable Programming ROM but I need to know what's the purpose or where it going to be used in MCU?
I ask this because some of MCU dont have EEPROM ( EEPROM = 0 byte) ie 80NC535 & 80NC321 and the best thing about this MCU (without EEPROM) that's its cheaper than MCU with EEPROM. If it just minor used and can solve it in other method (and not effect my project) , I will use it as I need to lower the cost as much as possible.
Any instruction (ie in proton) that must be used on MCU with EEPROM ?
More explanation greatly appreciated.
Thanks
zuisti
Hi "zuisti",
She wants the EEPROM for keeping the program when changed.
Will flash Magic Support this one ?
I happen to have a few pieces of this controller!!
I'm ready(?) with this work yet. It is a two mode (switchable) 8 char dot matrix display, working in Proteus, with source in javaC: I'm used a 89c734a.
- in scrolling mode it has a buffer for a max 54 chars message. The speed is controllable. - in static mode it is cascadable, set the position in the received string with the pos. switch.
The attached ZIP contains the orig. article (a PDF), as my start point. Please read it!
Please post here your minds!
"She wants the EEPROM for keeping the program when changed."
No, she doesn't. I checked with her and she wants it for calibration data storage.
hope you had a good weekend.I saw you're sister over at the mall on saterday.i was waring a teeshirt ;-)
The latest work is a verrrry Interesting Project... and I really like it very much...... I know saying thank you is not enough for your hardwork and cleverness at doing this project..... but thats all i can do for the now.
I have build an app to work with the lovely app from jenjen.
Can you test it because i have very limit time now and tell me if working ?
Also if you want anything to add.
file is at the usual place.
The upload has problem or it limitation ?
yes i think the system could crash, but in my project i only use the lpt & the screen. if you think that the system would be stable. But my questions is what happens with MCU, maybe MCU dont like working without interruptions.i don't need to get back to MCU once my programm has finished.
this is like an embedded project the pc only has to show the signal from the picture in the screen.
ya, i know you saw her.our mum wasnot happy :O
Thanks for the compliments. but remember that the project wouldnt be so good if you werenot there to give me good profesional help and advise. i trust Your wisdnom and experience .
Rego was near right with capacitor. but he is not so profesional and right always ;)
best advise is have a capacitor that is biger for what you need. so if you need 50poofs you can use 100poofs (or more) and it will be ok. you MUST connect the right way or they pop!
your friend,
dazheng
No, poof capacitors (pF) are not polarized. Poff capacitors (electrolytes and tantals) are polarized.
The question here isn't if the capacitance should be doubled, but what voltage it should be, and if the ripple current is high enough that the ESR must be considered.
Hi again zuisti,
i check with jafnek about capacitors.he says that you should try to get the mylar ones bcoz they are more cheep and best for digital MCU baords. bcoz your board is more that 50meg you dont want the polyproperlene ones.he says they are no good at are not good at high speeds.
forget trollop bcoz he does npt know. if you connect wrong way(to mains) the capcitor will pop.
You really are a funny guy. The metallized polyester caps are not polarized...
And by the way - are you going to decouple to mains...
"The latest work is a verrrry Interesting Project... and I really like it very much...... I know saying thank you is not enough for your hardwork and cleverness at doing this project..... but thats all i can <do for the now."
Please cease the slow keyboard fingering. The "rrr" and "...." nonsense is discredits our project. We are being ridiculed.
"But my questions is what happens with MCU, maybe MCU dont like working without interruptions."
Next time I think we shouldn't be so parsimonious and should pay additional for the non-lazy version of the MCU.
YAAAAAAA.I found the answer to last week and i think we can go for it.
A op amp may be analogue in design but it is frequencly used in digital equipment, i.e. analog to digital converters , esp 'flash' conversion... the question asked is difficult to answer because it is phrased badly.. a op amp is as different to a 'analogue ic' as a apple is different to an cow, a analogue(?) ic may contain op amps, but it will also have other 'stuff'... an op amp is just that..no more
can we connect them togethr and make an automatic MCU input for the module?
the code for the capacitor is ok qnd i will get some tomorrow.the MP3 file is now working and i only get a jump each 27 seconds. you were very right with the sector size.
pleas e give me advise and your wisdom again.
"bcoz your board is more that 50meg you dont want the polyproperlene ones.he says they are no good at are not good at high speeds."
So, if I run at the high speed I should get the polywronglene ones? Since those are much harder to come by, I'll change the gating clocker to do low speeds. OK?
"a op amp is as different to a 'analogue ic' as a apple is different to an cow,"
No, an op amp is as different to a 'analogue ic' as a nectarine is to an badger.
"I saw you're sister over at the mall on saterday.i was waring a teeshirt ;-)"
Yikes! Is that all? Since we're fond of the word "trollop" here ... Nuf said. ;-)
* 5A3266E3-82B2-4DCB-8A0C-23BE1236021C still wonders if the mains is only 110V, or if the decouplingof the MCU will be to 220/230V AC.
* 5A3266E3-82B2-4DCB-8A0C-23BE1236021C also wonders which newspaper that will publish pictures of thelittle oops.
* 5A3266E3-82B2-4DCB-8A0C-23BE1236021C further hopes no ambulance will be needed.
I know you rbusy but i really need some advice from the programmer guru plz.
what is 'port change interrupt' (ports 4,5,6,7) means ... is it port change from low to high or high to low analog signal(?) or a changes of digital signal ie from 5V to 4.7V or 4.26V?
i need to further reduce the power consumption, all unused of hardware peripherals should be disabled. The pullups should be replaced with external resistors, and the internal pullups disabled with a resistor.but what value(?)
please be generous with your wisdoming voice.
Thanks,
"what is 'port change interrupt' (ports 4,5,6,7) means ... is it port change from low to high or high to low analog signal(?) or a changes of digital signal ie from 5V to 4.7V or 4.26V?"
Such silly questions.
Such a waste of a guru's time.
"what is 'port change interrupt' (ports 4,5,6,7) means ... "
Good grief. Just look it up. No wonder our project sucks so bad. You're just mucking about blindly without reading a thing.
GET WITH THE PROGRAM!
"is it port change from low to high or high to low analog signal(?) or a changes of digital signal ie from 5V to 4.7V or 4.26V?"
Yes.
internal pullups disabled with a resistor.but what value(?) This is an easy question. You need a resistor with the same value as the data sheet specifies for the internal pull-up, but with a negative value. Alas, negative resistances are a bit harder to manufacture, so it may affect your production cost slightly. I haven't seen anyone manufacturing monolithic negative resistors, but with a suitable power source and your loved op-amps, you may even produce your own negative resistors :)
morning dazheng,
ive been working for too long but making progress.
thanks for your guru advise.i now have another bug found but with the MCU talking but have talking between them wrong.
I am new to 874C35 and want to play with it. So I need to build a programmer. Please advice me which programmer should I build considering most supported device including 874C31, which also supports WINMCU200, heard it is very handy than ic-prog. Found this MCU programmer based on JIT programmer and seems handy to me because it supports both LRP and HCAP. Does anybody used this programmer ? Does it supports winmcu800? If so how to configure ?
i know you are busy but your experiece is needed for my helping .
yawn yawn.
Hi zuisti mate,
the 874C35 looks good.i have the datashits and i like facilities. the Programmer is not so easy to find and i saw 874C31 also but is diferent(?)
I look more for you.
can you give me profesional advise now please on motor drivers.
you were lookin at the efkar motor driver circit i think and i want to see schematic essentials exigent,
please assistance please
qotd
Remember! You are unique, just like everybody else.
great huh?!?!
"Does anybody used this programmer ?"
Yes, somebody does.
"Does it supports winmcu800?"
Just like it says on the tin.
"If so how to configure ?"
Fill in the options under the configuration menu.
"i have the datashits ..."
Ugh! Depending on their orientation "at exit", the ones hurt worse than the zeros, don't they?
"diferent(?)"
Right, you're wrong.
"please assistance please"
I hope you cure those datashits soon. You're really stinkin' up the joint. No assistance however. You do your own wiping.
dazheng,
the efkar motor driver circuit is simple but has lots of pins to connect up for the steppering.I had tried a stepper motor controller n driver with L5297 + LR623 and result is perfect.but sometimes it doesnot start and sometimes goes backwards(?) you will use this circuit in the purposed CNC machine.
see home.att.net/.../MD4.html
i think we could make it beter.yes(?)
"backwards(?)"
Yes, good one. A silver star for you.
"i think we could make it beter.yes(?)"
"beter"? No.
"better"? Yes, but no.
In any case, no you couldn't make it better. Even the best CNC machines sometimes don't start. That's just the way they are. CNC motion includes going backwards.
Don't worry.
No improvement needed.
Hi ziusti,
do we we get the 2543b? i think the nmck-45892zr is better(bcoz bigger voltege).
And my proposition is an additional soft-start circuit with an R-LC and an SiAg-diode ...
does you somone have an idea of how to do a control of an induction single phase motor , i ve done one project in my life but it was for three phase, it was depending on the fase angle i think been a long time ive done it, do ou think i can use this priciple with a single phase motor that is monitor the phase via an opto coupler fed to a mcu and the mcu drive an optocouple to drive a triac by pwm?, my pump is is rated 0.5hp my problem is that i have installed a pump for my bathroom and the maximum pressure for my shower heater is 3 bars and my pump is working at 4 bars, the main problem i fear is that the pipes in my shower get damaged quickly and secondly the frequent start of the automatic pump will damage the stator of my motor.
if she goes backward the water is suck up shower; LOL
thanks in advance
"do we we get the 2543b? i think the nmck-45892zr is better(bcoz bigger voltege).
if she goes backward the water is suck up shower; LOL"
"result is perfect. but sometimes it does not start"
This is clearly some new meaning of "perfect" of which we were previously unaware!
That's kind of "perfect in an imperfect sort of way", then?!
I'll tell the QA guys to stop being so negative - everything is "perfect", even if it doesn't work properly!
result is perfect. but sometimes it does not start Maybe they mean "complete" when saying perfect. This would explain why it does not start: It started some time ago and has ended now?
"Maybe they mean 'complete'"
As in, "complete nonsense" - like the rest of the thread...?
I'm dying to see the "machine" these two are trying to conjure up. Apparently it has something to do with an MP3 Player, a bathroom shower, and a CNC machine that is ok if it runs backwards.
This thread has to be a long-winded hoax...there just isn't any way two people can be this stupid!
R
That is what we hope, even if they are quite amusing.
"... a bathroom shower ..."
Plugged up by the very bushy sister that wears only tee-shirts who is such a bad cook that she gives her brother the datashits.
??? why the trollops keep trying to hyjack our project thread ???
i think we must use the secret code to hide detail or they will copy our ideas.
Ive gone back to the playa and want better snd.
I have a pair of unused 5.1 speakers. I was using them with my pc. I want now to use them with my 'television'. The problem to solve is: The speakers have two stereo inputs. One for low frequencies, one for middle rage frequencies and one for hight frequencies.
I want to design an active filter that will be able to split the stereo signal from my 'tv' to this three sections of frequencies.
Many years have passed since I was designing filters and I would like your help. i think we need mcu to do it better with lot more code for better sound. If there is a schematics out there it would be great.
plz.U hv to design active filter according to the frequency response of ur speakers. Then u will get excellent performance from ur filter. I hv one small swollen key filter design software but unable to upload here.
i know it is need for quick. but i know you are good strong profesional guru that helps again.
Thanks mate
... or they will copy our ideas. Hehe.
View all questions in Keil forum