Use the CCP module in PWM mode.

Set the period to 1 instruction time (PR2 = 0)

Set the duty cycle to 1/2 of an instruction time using the resolution
extension bits.

Use an Fosc of 16Mhz

Now instruction clock is 4Mhz and you will get a 4MHz clock on the PWM
output pin.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)


----- Original Message -----
From: "Brent Brown" <brent.brown@CLEAR.NET.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, August 09, 2001 10:39 PM
Subject: Re: [PIC]:need 4Mhz clock out of 16F628


> > Can I get the PIC (16F628) to output clock (4Mhz) . I am free to
> > choose the PIC clock to 8 or 16 Mhz. rgds ramana b v
>
> Not sure what you mean exactly, but if you run the chip in RC
> oscillator mode the OSC2 outputs osc/4. Maybe you can use an
> external 16MHz oscillator feeding into OSC1 and get a 4MHz output
> from OSC2. Need to check in the data sheet to see if this is allowed.
>
> Brent Brown
> Electronic Design Solutions
> 16 English Street
> Hamilton, New Zealand
> Ph/fax: +64 7 849 0069
> Mobile/text: 025 334 069
> eMail:  brent.brown@clear.net.nz
>
> --
> http://www.piclist.com hint: To leave the PICList
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>
>

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