Reply by analogconsultant●January 12, 20052005-01-12
Hello Benno,
The MSP430 cannot really spit out a sine wave on a port pin. Take a
scope that has at least 100MHz bandwidth and make sure the probe is
adjusted right and matches the scope. Use a short ground lead, no more
than five centimeters or so. You should see a square with, of course,
finite ramp times. If not, maybe you have loaded up this port pin a
bit on the heavy side.
If you want to have faster rise times you'd have to use a 3.3V
compliant fast Schmitt trigger afterwards. TI would also be a good
source for those.
I like that word "Zweitfunktion" in your code. Sounds like
"Zeitgeist".
Regards,
Joerg.
Have you followed the procedure to change MCLK source from the DCO to a
crystal? Maybe this is what is missing. Take a look on page 4-12 of the
user's guide.
Regards,
Adriano.
shura1974 wrote:
>
> Probably its a problem of a low scope bandwidth
>
> --- In msp430@msp4..., "bennogassmann" <gassmann.b@b...>
> wrote:
>
>>
>>Hi,
>>On Port 5.5 (pin 49) a want to have a rectangular 8MHz-signal.
>
> There
>
>>is allready a "sine" 8MHz clock.
>>I tested the following code:
>>.......
>>SetupP bis.b #0FFh,&P4DIR ; P4 0-7 sind output
>> bic.b #080h,&BCSCTL1 ; XT2 ON
>> mov.b #088h,&BCSCTL2 ; MCLK=SMCLK=XT2CLK
>> bic.b #OFIFG,&IFG1 ; Clear OFIFG
>> bis.b #030h,&P5DIR ; P5.4/5.5 output
>> bis.b #030h,&P5SEL ; P5.4/5.5 Zweitfunktion ein
>>
>> bis.b #006h,&P5DIR ; P5 1+2 sind output
>> bis.b #002h,&P5OUT ; WR = 1 / inaktiv
>>........
>>who nows a answer?
>>
>>kindly B. Gassman
>
>
>
>
>
>
> .
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
Reply by shura1974●January 12, 20052005-01-12
Probably its a problem of a low scope bandwidth
--- In msp430@msp4..., "bennogassmann" <gassmann.b@b...>
wrote:
>
>
> Hi,
> On Port 5.5 (pin 49) a want to have a rectangular 8MHz-signal.
There
> is allready a "sine" 8MHz clock.
> I tested the following code:
> .......
> SetupP bis.b #0FFh,&P4DIR ; P4 0-7 sind output
> bic.b #080h,&BCSCTL1 ; XT2 ON
> mov.b #088h,&BCSCTL2 ; MCLK=SMCLK=XT2CLK
> bic.b #OFIFG,&IFG1 ; Clear OFIFG
> bis.b #030h,&P5DIR ; P5.4/5.5 output
> bis.b #030h,&P5SEL ; P5.4/5.5 Zweitfunktion ein
>
> bis.b #006h,&P5DIR ; P5 1+2 sind output
> bis.b #002h,&P5OUT ; WR = 1 / inaktiv
> ........
> who nows a answer?
>
> kindly B. Gassman
Reply by Karl Adler●January 11, 20052005-01-11
What processor are you using ????!!!!!
>From: "bennogassmann"
<gassmann.b@gass...>
>Reply-To: msp430@msp4...
>To: msp430@msp4...
>Subject: [msp430] msp430F149: 8MHz ckock on p5.5
>Date: Mon, 10 Jan 2005 19:02:34 -0000
>
>
>
>
>Hi,
>On Port 5.5 (pin 49) a want to have a rectangular 8MHz-signal. There
>is allready a "sine" 8MHz clock.
>I tested the following code:
>.......
>SetupP bis.b #0FFh,&P4DIR ; P4 0-7 sind output
> bic.b #080h,&BCSCTL1 ; XT2 ON
> mov.b #088h,&BCSCTL2 ; MCLK=SMCLK=XT2CLK
> bic.b #OFIFG,&IFG1 ; Clear OFIFG
> bis.b #030h,&P5DIR ; P5.4/5.5 output
> bis.b #030h,&P5SEL ; P5.4/5.5 Zweitfunktion ein
>
> bis.b #006h,&P5DIR ; P5 1+2 sind output
> bis.b #002h,&P5OUT ; WR = 1 / inaktiv
>........
>who nows a answer?
>
>kindly B. Gassman
>
>
>
>
>
>
>
>
>.
>
>
>Yahoo! Groups Links
>
>
>
>
>
>
>
_________________________________________________________________
Express yourself instantly with MSN Messenger! Download today - it's FREE!
http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
Reply by bennogassmann●January 10, 20052005-01-10
Hi,
On Port 5.5 (pin 49) a want to have a rectangular 8MHz-signal. There
is allready a "sine" 8MHz clock.
I tested the following code:
.......
SetupP bis.b #0FFh,&P4DIR ; P4 0-7 sind output
bic.b #080h,&BCSCTL1 ; XT2 ON
mov.b #088h,&BCSCTL2 ; MCLK=SMCLK=XT2CLK
bic.b #OFIFG,&IFG1 ; Clear OFIFG
bis.b #030h,&P5DIR ; P5.4/5.5 output
bis.b #030h,&P5SEL ; P5.4/5.5 Zweitfunktion ein
bis.b #006h,&P5DIR ; P5 1+2 sind output
bis.b #002h,&P5OUT ; WR = 1 / inaktiv
........
who nows a answer?
kindly B. Gassman