Hello,

I am using Timer Module, UART Module and WDT+ of 430F2370 microcontroller.
When I try to use different clock sources for these modules, I observed
different responses from the system.

If I use ACLK for the UART Module and SMCLK for the others (WDT+ and Timer)
, the system works properly. However If I switch to SMCLK for UART, the
system shows some inconsistencies.

Besides, If I use ACLK for timer and SMCLK for the others, the system also
shows instable responses.

The question is that, does a clk source have a limit or capacity to be used=
?
Couldn't I use a clk signal for any purposes I need? Is there any
restriction for that?

----

As a second question; In the datasheet, there are time intervals for DCO
frequency and minimum and maxim=C4=B1m values exist for each interval.

How can I be sure about the exact frequency of DCO for a selected interval?
In other words, how does DCO frequency change within a selected interval?

Thank you very much...

--=20
Soner ISIKSAL
[Non-text portions of this message have been removed]

------------------------------------

______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.


(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )

I would not call ACLK, SMCLK, or MCLK "clock sources". I call them clock ro=
uters. Crystal oscillators, Digital Controlled oscillators, etc. are what I=
called clock sources. You cannot connect a source to its destiny directly.=
You need to use one of the routers.

No there is no limit of how many destinies a router has to deliver.

The DCO uses semiconductor resistors and capacitors to generate the time ba=
se. The current technology cannot make them precise. They vary from batch t=
o batch. Within the batch, they vary from chip to chip. And for each chip, =
they still vary depending on temperature, voltage, and age. This is what th=
e min/max about.

--- In m...@yahoogroups.com, SoneR wrote:
>
> Hello,
>=20
> I am using Timer Module, UART Module and WDT+ of 430F2370 microcontroller=
.
> When I try to use different clock sources for these modules, I observed
> different responses from the system.
>=20
> If I use ACLK for the UART Module and SMCLK for the others (WDT+ and Time=
r)
> , the system works properly. However If I switch to SMCLK for UART, the
> system shows some inconsistencies.
>=20
> Besides, If I use ACLK for timer and SMCLK for the others, the system als=
o
> shows instable responses.
>=20
> The question is that, does a clk source have a limit or capacity to be us=
ed?
> Couldn't I use a clk signal for any purposes I need? Is there any
> restriction for that?
>=20
> ----
>=20
> As a second question; In the datasheet, there are time intervals for DCO
> frequency and minimum and maxim=C4=B1m values exist for each interval.
>=20
> How can I be sure about the exact frequency of DCO for a selected interva=
l?
> In other words, how does DCO frequency change within a selected interval?
>=20
> Thank you very much...
>=20
> --=20
> Soner ISIKSAL
>=20
>=20
> [Non-text portions of this message have been removed]
>
------------------------------------



(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )

Thank you very much for your interest and your correction about my imperfect
terminology - clock source -
The problem I have encountered may have an extraordinary reason since you
said "No there is no limit of how many destinies a router has to deliver"

Thanks...
--
Soner ISIKSAL
[Non-text portions of this message have been removed]

------------------------------------



(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )

You can set up P1.4 to show you the SMCLK and use an oscilloscope or frequency meter to determine its frequency.

Are you using DCO to drive SMCLK? If you use the calibration stored in Info Flash to set up DCO, its frequency should be within 3%.

--- In m...@yahoogroups.com, SoneR wrote:
>
> Thank you very much for your interest and your correction about my imperfect
> terminology - clock source -
> The problem I have encountered may have an extraordinary reason since you
> said "No there is no limit of how many destinies a router has to deliver"
>
> Thanks...
> --
> Soner ISIKSAL
> [Non-text portions of this message have been removed]
>
------------------------------------



(You need to be a member of msp430 -- send a blank email to msp430-subscribe@yahoogroups.com )