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'16C74'
1994\09\16@023450 by crocontroller discussion list

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I heard these just went into sample(call MicroChip today).  Has anyone
gotten ahold of one to play with?  I really want to see how well the UART
on it works...  Also 4K of eprom! 2K is too little on the 64 i think.
The 64 can do so much but with only 2K you can exploit only a little of
it :(
later
       John

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1994\09\16@191633 by crocontroller discussion list

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John M. Johnson <johnsonjspamKILLspamUTDALLAS.EDU> asks:
> Has anyone gotten ahold of one to play with?

I just today recieved my PICSTART-16C with a PIC16C74 sample (marked
"ENG SMP" and with a date code of 9430.

I'll try it out tonight.

> Also 4K of eprom! 2K is too little on the 64 i think.
> The 64 can do so much but with only 2K you can exploit only a little of
> it :(

I'd settle for 2K or even 1K.  I have yet to run out of EPROM on a 16C71,
although one of my projects got close.  On the other hand, I'm constantly
having to pack my RAM usage, so having more than 36 general purpose file
registers is a big win.  I also hope they get the 16C63 and 16C73 out soon.
Only occasionally do I need more than 20 I/O lines.

IMHO, if you need a lot of ROM or a lot of I/O, you probably are better off
with a 68HC11 or 8051 derivative.  They seem to be more cost effective than
the larger PIC parts.  While I don't find the PIC to be too hard to program,
I usually find the HC11 to be easier (mostly due to the better addressing
modes).  On one project I found the most effective solution was to use an
HC11 for most of the control, and a PIC16C71 for the time-critical portion.

Eric


'16c74'
1995\11\14@122458 by Glyn Davies 'Gryn'
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Hi all,

Sorry to ask the very basics, but I'm running into a little trouble :(

I've connected up a PIC 16C74 on a breadboard, and am feeding in a
4Mhz signal onto pin 13 (the Clk in pin) from a signal generator.

I'm applying 5v to pins 11 & 32, with 0v on 12 & 31

As far as I can tell at the moment, that should mean a program I put
onto the pic should run?

So I wrote a small program (very small :) to turn port D into an output
and blat bits out of it, incrementing. .  such as this

org 0
       goto start


org 50

start
       movlw B'00000000'
       movwf TRISD             ; Setup port D for all outputs

       clrf PORTD              ; Blank it

       bsf STATUS, RP0

main_loop
       addlw 1                 ; add 1 to W
       movwf PORTD             ; copy W to port D
       goto main_loop

end

This appears to toggle between 8 & 9 for some reason under MPSIM
Am I missing something?
Does anyone have any sample 16c74 code out there I could peruse :)

Cheers,

Glyn D.

--

Glyn D / http://www.cs.man.ac.uk/~daviess / Computer Science 3rd year

------------------------------------------------------------------------
             "Whom computers must destroy, they must first drive mad."
                                                       -- fortune

                                    "What if everyone felt like that?"
                                                       -- Catch 22
------------------------------------------------------------------------

1995\11\14@124414 by John Payson

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> I've connected up a PIC 16C74 on a breadboard, and am feeding in a
> 4Mhz signal onto pin 13 (the Clk in pin) from a signal generator.
>
> I'm applying 5v to pins 11 & 32, with 0v on 12 & 31

What about /MCLR?  If you don't pull it up, the chip will stay in reset.
What oscillator mode are you using?

> So I wrote a small program (very small :) to turn port D into an output
> and blat bits out of it, incrementing. .  such as this

You're using the outputs "open-collector"?  It looks like you're writing to
the TRIS registers? [bcf RP0 to avoid that methinks]

1995\11\14@125234 by Brian Read

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Glyn:

Set STATUS, RP0 _Before_ writing to TRISD and
clear STATUS, RP0 _After_.

The code for any of the PIC 16CXX's (not 5X's)
applies directly, as far as style and method.
The '74 just has more stuff. The '5X code applies
with some minor mods. Get the embedded control
handbook and read it and the data book.

Brian

1995\11\14@130729 by Glyn Davies 'Gryn'

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>
> > I've connected up a PIC 16C74 on a breadboard, and am feeding in a
> > 4Mhz signal onto pin 13 (the Clk in pin) from a signal generator.
> >
> > I'm applying 5v to pins 11 & 32, with 0v on 12 & 31
>
> What about /MCLR?  If you don't pull it up, the chip will stay in reset.
> What oscillator mode are you using?

I've tried with it pulled up, seems no go still :(

The oscillator is in XT mode, the signal is coming from a function generator

>
> > So I wrote a small program (very small :) to turn port D into an output
> > and blat bits out of it, incrementing. .  such as this
>
> You're using the outputs "open-collector"?  It looks like you're writing to
> the TRIS registers? [bcf RP0 to avoid that methinks]
>

What will a bcf RP0 do then?

Thanks,

Glyn

--

Glyn D / http://www.cs.man.ac.uk/~daviess / Computer Science 3rd year

------------------------------------------------------------------------
             "Whom computers must destroy, they must first drive mad."
                                                       -- fortune

                                    "What if everyone felt like that?"
                                                       -- Catch 22
------------------------------------------------------------------------


'16c74'
1996\08\19@092129 by Brad Pousland
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Is the 16c74 CERDIP windowed package UV erasable or OTP?

Brad

1996\08\19@095622 by Clyde Smith-Stubbs

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Brad Pousland <.....bpouslanKILLspamspam.....MOLE.UVM.EDU> wrote:

> Is the 16c74 CERDIP windowed package UV erasable or OTP?

If it's windowed, it's a fair bet it's UV erasable!

--
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1996\08\19@095626 by liebchen

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Brad Pousland wrote:
> Is the 16c74 CERDIP windowed package UV erasable or OTP?

It is windowed, so it is erasable!

Wolfram
--

+-----------------------------------------------+
! Wolfram Liebchen, @spam@liebchenKILLspamspamipserv.ffo.fgan.de !
!        Forschungsinstitut fuer Optik          !
+-----------------------------------------------+

1996\08\20@030930 by Erik Nieuwlands

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> Is the 16c74 CERDIP windowed package UV erasable or OTP?

No, it is solar powered!

Erik
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