> Herbert,
>
> I finally hooked up the BitScope to the ZiLOG dev board and with this
> small bit of assembler I can toggle the pin at around 1.2MHz.
>
>                 ld      a,00h
>                 out0    (PC_ALT2),a
>                 out0    (PC_ALT1),a
>                 out0    (PC_DDR),a
> loop:
>                 ld      a,00h
>                 out0    (PC_DR),a
>                 ld      a,01h
>                 out0    (PC_DR),a
>                 jr      loop
>
> Doing the same in C makes it toggle around 560kHz.
>
> Regards
> Jean-Michel.
>
>
>> On Sun, 2004-08-22 at 20:00, Matt Pobursky wrote:
>> > Herbert,
>> >
>> > Check the eZ80 datasheet -- I seem to recall that the internal flash
>> > has is quite slow and uses a bunch of wait states. Also make sure they
>> > are not using RAM with wait states. The external bus cycles at 50 MHz
>> > are pretty short and take some darn fast (and expensive) memories to
>> > run with few or no wait states.
>> >
>> > I ran into this same kind of problem with the Rabbit CPUs when they
>> > came out with their 44MHz R3000 chip. It only ran marginally faster
>> > than a 22MHz R2000 CPU. The cause was adding wait states because they
>> > used Flash that couldn't run with 0 wait states.
>> >
>> > Matt Pobursky
>> > Maximum Performance Systems
>>
>> BINGO!!! Thank you so much Matt, I think you nailed it on the head!
>>
>> I changed the config from "run from ROM" to "run from RAM" and BOOM,
>> twice the speed! My little ping toggles at 2-3 times the speed. Well, at
>> least now I know. Thank you all again for your help.
>>
>> That said, I guess it really shows how much more efficient a PIC can be
>> (even with a /4 of the main clock) for simple IO stuff.
>>
>> This thing is still gonna run slower then I was expecting, so I guess
>> I'll go ahead with what I was thinking, and then move it to a
>> PIC/AVR+CPLD when I'm done. Thanks again, TTYL
>>
>> -----------------------------
>> Herbert's PIC Stuff:
>> http://repatch.dyndns.org:8383/pic_stuff/
>>
>> --
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>
>
>
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> >>I finally hooked up the BitScope to the ZiLOG dev board and with this
> small bit of assembler I can toggle the pin at around 1.2MHz.
> >>                ld      a,00h
> >>                out0    (PC_ALT2),a
> >>                out0    (PC_ALT1),a
> >>                out0    (PC_DDR),a
> >>loop:
> >>                ld      a,00h
> >>                out0    (PC_DR),a
> >>                ld      a,01h
> >>                out0    (PC_DR),a
> >>                jr      loop
> >>Doing the same in C makes it toggle around 560kHz.
> >>Regards
> >>Jean-Michel.
>
>
>Hmm.. What clock?  In AVR, at 4 MHz xtal, I can get to this:
>
>         sbi     DDRB,1  ;Makes bit 1 an output
>
>Here:
>         sbi     PORTB,1 ;Take it high
>         cbi     PORTB,1 ;take it low
>         rjmp    Here    ;
>
>Three words of code space in the loop, no register use, no flags affected,
>and 1.5uS/cycle  Of course with the max 16 MHz clock, it would be 375nS or
>2.6 MHz

> Well, they have some "teletraining" on the Cypress site. I found it to
> not be too bad. Really the hardest part was figuring out all the
> intricacies of their IDE. It's very different from coding for a PIC,
> you use the IDE to specify which hardware blocks to use and how to
> connect them. While I'm sure this could be done by hand or with an
> external development environment, it wouldn't be my choice. I am
> fortunate enough to have an ICE here at work, so that helped a lot,
> but just the invention board should be ok, just no debug. The sample
> code and APIs that are given with the blocks are pretty good. I got
> the LCD block working almost instantaneously. Tell the IDE you want to
> use it (so it compiles in support). Then issue the right commands (ie
> an init, and a write, etc) and viola, text on the screen.
>
> Josh