Hi,

   I have a couple of simple designs around a PIC16F877A - one motor
control circuit and one for maximum power point tracking of a solar
panel. I'm using a couple of ADC channels and a few GPIO pins along
with one timer. I'm using 20 MHz oscillators

   I need to do 8x8 and 16x16 multiplication. For now, I'm using code
from the Piclist code library, that gets the job done in about 40
cycles and 140+ cycles.

   I got myself two of the PIC 18F4520 devices. They appear to have
the same layout for the IO pins as the 16F877A. I'm planning to port
my assembly code to these devices.

   What do you think I might have to watch out for? Will the assembly
code for the 16F device work straight away on the 18F device? And can
I just replace the 16F device with the 18F device in my circuit?
Anything that needs to be configured differently?

   Do you think it's possible to use the 18F device straight away in
the original circuit with maybe minor modifications (given the
simplicity of the circuit)? If so, would that make the 18F4520 a
direct replacement for the 16F877A as the generic prototyping PIC? (I
remember Forrest Christian bringing up this topic earlier this year).

Thanks in advance,
Anand

__________________________
Anand Gadiyar,
CEDT,
Indian Institute of Science,
Bangalore - 560 012
Phone: +91-98862-70030
__________________________
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