I don`t find a timer regirter into BS2p40

Archiver

I need a information about the registers, where i can find nformation
about TIMER or Cycle to program my clock and Date..... Because i need
a internal signal with 1 sec or 1msec to programing my specific
application (Big Clock and Date with 7-segment (Very big)24 led per 7-
segment)...

If you have a program for similary applocation... I appreciate that
you send my by email or you will tell me about what book to read....

Note:
I red the STAMP BASIC BOOK and I didn`t find this information and It
is impossible this chip don`t have this TIMER...

I appreciate your prompt response

Best Regards

Ing Damian Trujillo G.
Venezuela, Caracas

Archiver

Unfortunately, you can't do accurate timing with a Stamp without using
external components. Not completely true - you can use the PAUSE statement
to generate a delay, but then you have to make sure all the various paths
through your program are the same length (in terms of instruction timing)
so that the delay plus the instruction timings are a constant. The to
calibrate the whole thing, you need access to a frequency counter/timer so
you can measure the period of the loop, and adjust the PAUSE delay until
you come up with a 1 second period for the loop. Messy indeed.

If you look on the Microchip web site, you will find application notes for
the Stamp. Appnote 20 describes how to use a 32768 hz watch crystal and a
divider chip to generate accurate time intervals, such as 1 second. This
works - I've done it.

Larry

At 04:51 PM 12/18/2002 +0000, you wrote:
>I need a information about the registers, where i can find nformation
>about TIMER or Cycle to program my clock and Date..... Because i need
>a internal signal with 1 sec or 1msec to programing my specific
>application (Big Clock and Date with 7-segment (Very big)24 led per 7-
>segment)...
>
>If you have a program for similary applocation... I appreciate that
>you send my by email or you will tell me about what book to read....
>
>Note:
>I red the STAMP BASIC BOOK and I didn`t find this information and It
>is impossible this chip don`t have this TIMER...
>
>I appreciate your prompt response
>
>Best Regards
>
>Ing Damian Trujillo G.
>Venezuela, Caracas
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

Larry Bradley
Orleans (Ottawa), Ontario, CANADA

Archiver

Damian:

Since the BASIC Stamp interpreter controls all the internal registers, your
best bet is to use an off-chip RTC like the DS1302 or the PCF8583. Both will
save you the trouble of synthesizing the time and date. You can find lots of
demo code for each at our web site.

Happy Holidays.

-- Jon Williams
-- Parallax


In a message dated 12/18/2002 10:54:56 AM Central Standard Time,
dtrujillo_riese@c... writes:

> I need a information about the registers, where i can find nformation
> about TIMER or Cycle to program my clock and Date..... Because i need
> a internal signal with 1 sec or 1msec to programing my specific
> application (Big Clock and Date with 7-segment (Very big)24 led per 7-
> segment)...
>
> If you have a program for similary applocation... I appreciate that
> you send my by email or you will tell me about what book to read....
>
> Note:
> I red the STAMP BASIC BOOK and I didn`t find this information and It
> is impossible this chip don`t have this TIMER...
>
> I appreciate your prompt response
>
> Best Regards
>
> Ing Damian Trujillo G.
> Venezuela, Caracas
>



[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

Yes, it is true about needing an external real time clock but this is the
code I came up with. Though I wouldn't actually use it but it should get you
started Sounds like I will be able to read your clock from where I stand.
Keep us posted.

seconds var byte
minutes var byte
hours var byte
days var byte
curhr var byte
curmin var byte

gosub update
for seconds = 0 to 60
if seconds = 60 then zerosec
if minutes = 60 then zeromin
if curmin = 60 then zerocurmin
if curhr = 24 then zerocurhr
pause 928 'calibrate here. last time i ran this
'program it lost 3 minutes in 2 hours

debug home, ? seconds, ? minutes, ? hours, ? days, cr, "Time is now ", dec
curhr,":",dec2 curmin
next


zerosec:
seconds = 0
debug cls
minutes = minutes + 1
curmin = curmin + 1
return


zeromin:
minutes = 0
hours = hours + 1
if hours = 24 then zerohrs
return

zerohrs:
hours = 0
days = days + 1
return

update:
if seconds + minutes + hours + days = 0 then currentime
return

currentime:
curmin = 8 'put current minutes here
curhr = 10
return


zerocurhr:
curhr = curhr - 24 'put current hour here
return

zerocurmin:
curmin = curmin - 60
curhr = curhr + 1
return


[noparse][[/noparse]Non-text portions of this message have been removed]