>The chip works fine when
>supplied with a 4.5V supply and when the supply is
>changed to 3.3V, the LEDs dont blink while one of
>the LEDs is lit up permanently. Another observation
>made is that when operating on a 3.3V supply, when the
>PIC is put to sleep, the oscillation circuit still
>operates!
>
>A supply of 3.3V is within the operating range but
>does it give a different operating result?

This sounds like the brownout detection is enabled. If, like other chips, it
has a voltage setting of about 4 volts, then you will need to disable it to
get down to this operating voltage.

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