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Discussion Groups | Piclist | Re: PIC18F458-I/P & max frequency( is it not 40mhz??)
A discussion group for the PICMicro microcontroller. Also called the Microchip PIC, this list is dedicated to the use and abuse of this fine, simple, microcontroller. Close to topic posts are welcome, ie. general electronics.
PIC18F458-I/P & max frequency( is it not 40mhz??) - AMIT KAPOOR - Aug 29 21:20:00 2004
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Hi , help me out! actually last week i got pic18f458-I/P and pic18lf458-I/P as sample. 1.Now when i test them for 4 mhz ,everything works fine ...but when i test them for 16 or 24 mhz nothing goes fine ...they work unexpectedly...why so? according to data sheet max frequency is 40mhz...is there any limitation as these chips are sample....i dont think so ....oscillator is working fine as i tested with some other chips...... 2.what is the difference between PIC18f458-I/P and PIC18lf458-I/P ( "l" is there in this chip)......something related to frequency? Please do reply.............i am confused where i am going wrong... thanx Amit Regards
Amit Kapoor
Robot Research Engineer
Robot R&D Team
DSME
South Korea
Life consists not in holding good
cards but in playing those you hold well.
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Re: PIC18F458-I/P & max frequency( is it not 40mhz??) - Nigel Symes - Aug 29 22:44:00 2004
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just out of interest what does the i/p
mean?
(Yes I am a newbie....)
Nigel
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RE: PIC18F458-I/P & max frequency( is it not 40mhz??) - Carlos Marcano - Aug 29 22:54:00 2004
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Amit,
Are you configuring the pic for the right freq? You have to check
the configuration word of the chip to be in the right kind of oscillator frequency. Check
the datasheet of the chip for info on the conf word.
About the "L" on the chip it means that it works for lower voltages than normal. Once
again check the datasheet. Good luck.
Regards,
*Carlos
Marcano*
-Guri,
Venezuela-
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RE: PIC18F458-I/P & max frequency( is it not 40mhz??) - martin de lange - Aug 29 23:05:00 2004
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The obvious question
that comes to mind is
did you set the oscillator config to the HS type as opposed to XT.
Also make sure the PLL is off if you do
not want to increment the frequency.
Check for correct Xtal cap values.
Sometimes engineering samples have amaximum operating frequency so check
for the absence of the marking ES From: AMIT
KAPOOR [mailto:k...@yahoo.com] Hi , Regards Amit
Kapoor Robot Research
Engineer Robot R&D
Team DSME Life
consists not in
holding good cards but in playing those you hold well.
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Re: PIC18F458-I/P & max frequency( is it not 40mhz??) - Leon Heller - Aug 31 2:36:00 2004
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----- Original Message ----- From: Nigel Symes To: Sent: Monday, August 30, 2004 4:44 AM Subject: Re: [piclist] PIC18F458-I/P & max frequency( is it not 40mhz??) just out of interest what does the i/p mean? Input. O/P is output. Leon -- Leon Heller, G1HSM http://www.geocities.com/leon_heller |
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Re: PIC18F458-I/P & max frequency( is it not 40mhz??) - Nigel Symes - Aug 31 5:37:00 2004
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so PIC18F458-I/P means this is an "input" chip? What does that mean?
----- Original Message ----- From: "Leon Heller" <> To: <> Sent: Tuesday, August 31, 2004 5:36 PM Subject: Re: [piclist] PIC18F458-I/P & max frequency( is it not 40mhz??) > ----- Original Message ----- > From: Nigel Symes > To: > Sent: Monday, August 30, 2004 4:44 AM > Subject: Re: [piclist] PIC18F458-I/P & max frequency( is it not 40mhz??) > just out of interest what does the i/p mean? > > Input. O/P is output. > > Leon > -- > Leon Heller, G1HSM > http://www.geocities.com/leon_heller > > to unsubscribe, go to http://www.yahoogroups.com and follow the instructions > Yahoo! Groups Links > |
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Re: PIC18F458-I/P & max frequency( is it not 40mhz??) - Leon Heller - Aug 31 5:53:00 2004
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----- Original Message ----- From: "Nigel Symes" <> To: <> Sent: Tuesday, August 31, 2004 11:37 AM Subject: Re: [piclist] PIC18F458-I/P & max frequency( is it not 40mhz??) > so PIC18F458-I/P means this is an "input" chip? What does that mean? I think it means ... - input & max frequency ... or, it could perhaps be the package, but I don't think so. Leon |
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Re: PIC18F458-I/P & max frequency( is it not 40mhz??) - mikerey35475 - Aug 31 6:29:00 2004
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--- In , "Nigel Symes" <symesbris@h...> wrote: > just out of interest what does the i/p mean? > > (Yes I am a newbie....) > From the Product Identification section of the manual:- PART NO. X /XX XXX | | |_________ temp range| |- case style |- pattern I = industrial temperature range -40 C to + 85 C P = PDIP case style = plastic dual in-line profile Mike |
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Re: PIC18F458-I/P & max frequency( is it not 40mhz??) - Igor Janjatovic - Aug 31 6:33:00 2004
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> so PIC18F458-I/P means this is an "input" chip? What does that
mean? Industrial temperature range, PDIP plastic package. Check last page of its data sheet. Every Microchip MCU has this information on last page of its data sheet. Regards, Igor |
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Re: PIC18F458-I/P & max frequency( is it not 40mhz??) - upand_at_them - Aug 31 10:05:00 2004
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The suffix refers to temp range and package type: I = -40C to +85C E = -40C to +125C P = PDIP L = PLCC PT = TQFP SO = SOIC SS = SSOP Mike --- In , "Nigel Symes" <symesbris@h...> wrote: > so PIC18F458-I/P means this is an "input" chip? What does that mean? |
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Re: Re: PIC18F458-I/P & max frequency( is it not 40mhz??) - Nigel Symes - Sep 1 17:39:00 2004
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Thanks Mike, I knew you'd have a clear answer like
always.
Thanks,
Nigel
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Re: PIC18F458-I/P & max frequency( is it not 40mhz??) - agha_khawer - Sep 2 8:05:00 2004
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Hi dear, I have a lot of expirence in working with PIC18Fxxxx. For 18F458 using any oscillator upto 40MHz its osc. must be HS. If you wan to opperate at 40Mhz use 10MHz crystal with 4x PLL enabled. It works great. even with 11MHz it works on 44MHz too but Microchip recommends not more then 40Mhz. PIC 18F series is a much better series, I love to work with theses 8bit powerplants. But I wish if they whre working on 80+ MIPS ;). Good Luck --- In , "Carlos Marcano" <carlosmarcano78@c...> wrote: > Amit, > > Are you configuring the pic for the right freq? You have to check the > configuration word of the chip to be in the right kind of oscillator > frequency. Check the datasheet of the chip for info on the conf word. > > About the "L" on the chip it means that it works for lower voltages than > normal. Once again check the datasheet. Good luck. > > Regards, > > *Carlos Marcano* > -Guri, Venezuela- > -----Mensaje original----- > De: AMIT KAPOOR [mailto:kaps_iit@y...] > Enviado el: Domingo, 29 de Agosto de 2004 22:20 > Para: > Asunto: [piclist] PIC18F458-I/P & max frequency( is it not 40mhz??) > Hi , > help me out! > actually last week i got pic18f458-I/P and pic18lf458-I/P as sample. > 1.Now when i test them for 4 mhz ,everything works > fine ...but when i test them for 16 or 24 mhz nothing goes fine ...they work > unexpectedly...why so? according to data sheet max frequency is 40mhz...is > there any limitation as these chips are sample....i dont think so > ....oscillator is working fine as i tested with some other chips...... > 2.what is the difference between PIC18f458-I/P and PIC18lf458-I/P ( "l" is > there in this chip)......something related to frequency? > Please do reply.............i am confused where i am going > wrong... > thanx > Amit > > Regards > Amit Kapoor > Robot Research Engineer > Robot R&D Team > DSME > South Korea > > Life consists not in holding good cards but in playing those you hold > well. > -------------------------------------------------------------------- -------- > -- > > instructions > Yahoo! Groups Sponsor > ADVERTISEMENT > -------------------------------------------------------------------- -------- > -- > Yahoo! Groups Links > > a.. To > > --- > Outgoing mail is certified Virus Free. > Checked by AVG anti-virus system (http://www.grisoft.com). > Version: 6.0.745 / Virus Database: 497 - Release Date: 27/08/04 |
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