At 9:26 AM -0400 8/14/01, Jeff DeMaagd wrote:
>If you are absolutely sure of the number of I/O pins then you could try the
>'f871 (2kB program space) or the 'f872.  The only Q would be the interrupt
>capabilities you desire.  They are IMO fairly cheap and readily available.
>
>They have a lot of interrupt capabilities but for normal digital I/O only
>port B has interrupt-on-change (pins 4 to 7) and an "external interrupt" on
>pin B0.  Most of the rest of the interrupts are tied to specific functions
>but there are a lot of them.  The '877 doesn't really have that many more
>interrupts but it does have an additional 8 pin port, another 3 pin port and
>a few more features elsewhere.

One small correction: the 'F871 has the same ports as the 'F877
(A,B,C,D,E, both are 40 pin parts), but less code space. The 'F870 is
the 28-pin version with fewer ports.

Dave Johnson

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