Rtc pcf8563

Archiver · 2004-06-28 21:09

I am having some problems getting my phillips PCF8563 real time clock
to work with the basic stamp/

I am able to set the time and date correctly. The time works well,
but when the day switches over it seems to be switching the month
also.

I set the time for 23:59, and wait for the date to switch, it will
increment the month and the day and I can't figure out why, it will
go from directly from 7/2/04, to 8/3/04

It also allows the month to go higher then 12.

anyone have any luck trouble shooting a problem like this?

thanks
MikeDolan
MikeD@B...

Archiver · 2004-06-28 21:16

By any chance do you have your days and months reversed as in
MMDDYYYY as compared to DDMMYYYY

The changing of the month when the time changes is what has led me to ask
the question

Original Message

From: MikDolan54 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=AGiibyeSzpj4I0bj_eFWuQw_NTWByhbEvKlMC41dyrzHkKHsbwdEg0uxZOmKhfFF8McXkjVxLv0q]MikeD@B...[/url
Sent: Monday, June 28, 2004 4:09 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] RTC PCF8563

I am having some problems getting my phillips PCF8563 real time clock
to work with the basic stamp/

I am able to set the time and date correctly. The time works well,
but when the day switches over it seems to be switching the month
also.

I set the time for 23:59, and wait for the date to switch, it will
increment the month and the day and I can't figure out why, it will
go from directly from 7/2/04, to 8/3/04

It also allows the month to go higher then 12.

anyone have any luck trouble shooting a problem like this?

thanks
MikeDolan
MikeD@B...

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Archiver · 2004-06-28 22:06

Do you mean the PCF8583? The year/date register is a bit funky on that
device; if I remember correctly the year value is actually an offset
from the last leap year (0 - 3, set in bits 6 and 7 of register 5). Are
you setting it correctly? Today, for example, would be coded as:

Reg $05 --> %00101000
--> %00 = 0 (2004 is leapyear)
--> 10 = 2 (tens digit of 28th)
--> 1000 = 8 (ones digit of 28th)

-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office

Original Message

From: MikDolan54 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=j8GRxadU8rnIETgYIJfUg6v5A8NIssicMdmifGzy9WM14m6eIiQ8wBvxhmBHuYeFr9FLhPX8RG8]MikeD@B...[/url
Sent: Monday, June 28, 2004 3:09 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] RTC PCF8563

I am having some problems getting my phillips PCF8563 real time clock
to work with the basic stamp/

I am able to set the time and date correctly. The time works well,
but when the day switches over it seems to be switching the month
also.

I set the time for 23:59, and wait for the date to switch, it will
increment the month and the day and I can't figure out why, it will
go from directly from 7/2/04, to 8/3/04

It also allows the month to go higher then 12.

anyone have any luck trouble shooting a problem like this?

thanks
MikeDolan
MikeD@B...

Archiver · 2004-06-29 14:25

Jon,
thanks for the response...
I haven't solved the problem yet, but I checked a chip I was using
this morning and it is a PCF8583 while my data sheet is for the
PCF8563.

I will find the correct data sheet and go from there.

Mike Dolan

--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> Do you mean the PCF8583? The year/date register is a bit funky on
that
> device; if I remember correctly the year value is actually an offset
> from the last leap year (0 - 3, set in bits 6 and 7 of register
5). Are
> you setting it correctly? Today, for example, would be coded as:
>
> Reg $05 --> %00101000
> --> %00 = 0 (2004 is leapyear)
> --> 10 = 2 (tens digit of 28th)
> --> 1000 = 8 (ones digit of 28th)
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>

Original Message

> From: MikDolan54 [noparse][[/noparse]mailto:MikeD@B...]
> Sent: Monday, June 28, 2004 3:09 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] RTC PCF8563
>
>
> I am having some problems getting my phillips PCF8563 real time
clock
> to work with the basic stamp/
>
> I am able to set the time and date correctly. The time works well,
> but when the day switches over it seems to be switching the month
> also.
>
> I set the time for 23:59, and wait for the date to switch, it
will
> increment the month and the day and I can't figure out why, it
will
> go from directly from 7/2/04, to 8/3/04
>
> It also allows the month to go higher then 12.
>
> anyone have any luck trouble shooting a problem like this?
>
> thanks
> MikeDolan
> MikeD@B...

Archiver · 2004-06-29 15:58

Jon,

I've looked things over and your were correct I was using the wrong
datasheet. Thanks for the help.

How do I keep track of the year with the PCF8583. It simply goes
from 0-3 and rolls over.

Do I have to keep track of how many times this year rolls over in a
EEPROM, and if so then I guess I have to keep this thing on all the
time. In other words if I were to not monitor it for a multiple
year span, how would I distinquish the year?

any insight would be appreciated...

thanks
mike

--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> Do you mean the PCF8583? The year/date register is a bit funky on
that
> device; if I remember correctly the year value is actually an offset
> from the last leap year (0 - 3, set in bits 6 and 7 of register
5). Are
> you setting it correctly? Today, for example, would be coded as:
>
> Reg $05 --> %00101000
> --> %00 = 0 (2004 is leapyear)
> --> 10 = 2 (tens digit of 28th)
> --> 1000 = 8 (ones digit of 28th)
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>

Original Message

> From: MikDolan54 [noparse][[/noparse]mailto:MikeD@B...]
> Sent: Monday, June 28, 2004 3:09 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] RTC PCF8563
>
>
> I am having some problems getting my phillips PCF8563 real time
clock
> to work with the basic stamp/
>
> I am able to set the time and date correctly. The time works well,
> but when the day switches over it seems to be switching the month
> also.
>
> I set the time for 23:59, and wait for the date to switch, it
will
> increment the month and the day and I can't figure out why, it
will
> go from directly from 7/2/04, to 8/3/04
>
> It also allows the month to go higher then 12.
>
> anyone have any luck trouble shooting a problem like this?
>
> thanks
> MikeDolan
> MikeD@B...

Archiver · 2004-06-29 16:16

Since you are entering the year anyway, you just need to know its relationship vis-

Archiver · 2004-06-29 19:49

Expanding on Jon's idea, you could using code
something like the following to track the year.
Note that the PFC8593 does count yr=0 as a leap
year and yr=1,2 or 3 as non-leap yeas, for the 28
or 29 days in February. The code looks for
rollovers in the yearly and 4 year cycle, and
automatically updates two eeprom locations when
necessary the first time the code runs after a
rollover.

yr0 DATA Word 2004 ' base of 4 year cycle, updated once/ 4 years
yrx DATA Word 2004 ' 1 year cycle, updated once/ year.

' ...
GOSUB get_yr ' yr=0 to 3 from PFC8593
READ yr0, Word baseYear
READ yrx, Word nowYear
IF baseYear+yr < nowYear THEN ' yr has rolled over from 11 to 00
year=baseYear+4 ' new leap year cycle
WRITE yr0, Word year
WRITE yrx, Word year
ELSEIF basYear+yr > nowYear THEN
Year=nowYear+1
WRITE yrx, Word Year
ELSE
Year=nowYear
ENDIF
debug ? year

-- Tracy

>Since you are entering the year anyway, you just
>need to know its relationship vis-

Rtc pcf8563

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