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'PIC as a PLD (was Flash vs EEPROM)'
1996\09\23@104111 by Scott Dattalo

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William Chops Westfield wrote:
> <snip>
>
> Consider, for example, a classic LED "chaser" circuit that lights 8 LEDs
> in sequence.  You can do this in medium scale logic by wiring it up.
> You can do it with a PLD using PAL type languages and tools.  That way you
> could stock one type of PAL to replace many types of logic chip  It might
> sort of look like this:
>
>     Q1 := /Q1 * /Q2 * /Q3 * /Q4 * /Q5 * /Q6 * /Q7 * /Q8 ; always supply 1 bit
>     Q2 := Q1                    ; Shift Left
>     Q3 := Q2                    ; Shift Left
>     Q4 := Q3                    ; Shift Left
>     Q5 := Q4                    ; Shift Left
>     Q6 := Q5                    ; Shift Left
>     Q7 := Q6                    ; Shift Left
>     Q8 := Q7                    ; shift Left
>
> And you could also do it with a PIC and software.

Sure can! If you want, check out how I use state machines to implement vertical
counters in a PIC:

http://www.interstice.com/~sdattalo/technical/software/pic/vertcnt.html


Scott

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