I am not quiet familiar with digital electronic or its intricacies, but
hopes are definitely high. My questions are completely logical. I am
referring to PICmicro mid-range MCU family reference manual. I am trying to
skill myself on PIC16F870.

The manual does not explains explicitly about the difference in-between the
different oscillator modes.

Each PIC device operates at a particular clock frequency range. Now we could
either have an internal or an external clock source as input to PIC device.
The clock is required for the device to execute instructions and for the
peripherals to function. For example a PIC operates with an external 4Mhz
clock input connected at its OSC1 and OSC2 pins. Now if the change the value
of C1 and C2 such that the clock frequency increases (more than the clock
range as specified for the device), how would PIC behave and WHY?

Regards,
Satya Prakash Prasad.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Jan-Erik Soderholm XA
(TN/PAC)
Sent: Wednesday, December 03, 2003 1:40 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]:PIC Oscillators


Prasad, Satyaprakash wrote:

> Hi All,
>
> What is difference between the LP, XT, and HS oscillator modes?

What *exactly* is it in the data sheet that is unclear ? I think
all data sheets quite clearly describes this.

> Can anyone please explain me the "EXTRC External
> Resistor/Capacitor with CLKOUT" oscillator mode?

The same...
And what PIC are you using ?
Note that the actual osc features are different between PICs.

> What will happen if an external RC clock of higher prescribed
> frequency is used?

What are you trying to do ?
How much higher ? With what R and C values ?
Where did you find a "RC clock prescribed frequency" ?

> Will the software completely halt or unexpected
> behavior could be expected?

When ?

Jan-Erik.

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