> setb PORTB,0
> setb PORTB,1
> nop
> clrb PORTB,0
> clrb PORTB,1
> 
> Pin 0 is set then goes low while pin 1 goes high, then pin 1 goes
> low - so it looks like the second "setb" doesn't occur until pin 0
> is cleared. The pulses don't overlap at all. Do you know what
> the problem is?

As you've realised, r-m-w can produce some peculiar effects.
Sometimes the pins output the complete opposite of what was
intended

http://www.piclist.com/techref/scenix/sxrmw.htm

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