I think that the Scenix works the same way,but I was very impressed with
its ability to drive a capcitive load on a pin. I had a test circuit with a
Scenix at 50Mhz driving a scope probe with about 20pF of capacitance. The
waveform easily reached the full 5v between consecutive SNB/CLRB
inctructions, with no NOPs. It was a while ago, but I think the rise time
was about 10ns.

Sean

At 08:44 AM 10/12/99 +0100, you wrote:
>I had endless troubles at only 4MHz due to driving a mosfet H-bridge which
>must have had quite a high capacitance.  One NOP between consecutive bit
>operations on the port cured it, but I felt worried about it so in the end I
>only set bits in a shadow register and wrote the register to the port to
>avoid all this.  It is very annoying to have to do this though.  It would be
>great if there was an option to make the PIC read from the output latch when
>TRIS=0, and from the pin when TRIS=1.  Bit manipulation of output ports is
>where microcontrollers are supposed to shine, not so in the case of the PIC.
>(Is the Scenix any better or the same?  I would think that it must be
>improved for operation at 50+ MHz)
>
>Mike Rigby-Jones
>
|
| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
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