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18F2550 configuration bits

 
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prayami



Joined: 22 Dec 2004
Posts: 78

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18F2550 configuration bits
PostPosted: Thu Jan 19, 2006 5:39 pm     Reply with quote
Hi...I am using 18F2550 for USB. And for that I want USB to run at
96Mhz and Microcontroller to run at 48MHz. For that I have set the
configuration bits like following. I am using 12Mhz crystal oscillator in
the hardware.

Specially I want to know, for Microcontroller to run at 48MHz, the
following configurations are correct or not.

Quote:


Category Setting:
________ ____________________

"Full-Speed USB Clock Source Selection": "Clock src from 96 MHz PLL/2"

"CPU System Clock Postscaler" "[OSC1/OSC2 Src: /1][96 MHz PLL Src: /2]"

"96MHz PLL Prescaler": "Divide by 3 (12 MHz input)"

"Oscillator": "HS: USB-HS"

"Fail-Safe Clock Monitor Enable": "Enabled"

"Internal External Switch Over Mode": "Enabled"

"USB Voltage Regulator": "Enabled"



Thanks...in advanced.........
prayami



Joined: 22 Dec 2004
Posts: 78

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PostPosted: Mon Jan 23, 2006 2:00 pm     Reply with quote
Can anybody able to answer, what to do for running PIC18F2550
at 48MHz? What configuration bits should be? Thanks....
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Jan 23, 2006 2:34 pm     Reply with quote
Look at what you're asking. You're asking someone to read the
data sheet and interpret the oscillator settings and basically do it
all for you. That's probably why no one has answered.

If you would read the data sheet, and then post a question such as
the following, then you might get some help:
"I don't understand this one paragraph in the oscillator section. (Give
the page and section #) I think it means this (explain what you think)
but I'm not sure. Can someone help me to understand this section of
the data sheet ?"
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