msp430 microcontroller maximum output delay

[yassin.kraouch]

Hi,
can you please help me to know what is the maximum output delay given by this microcontroller,
basically i want to lit up LED at 3 minutes and after that the LED will be off,
https://www.ti.com/lit/ug/slau144j/slau144j.pdf
https://www.ti.com/lit/ds/symlink/msp430f2013.pdf

 

[FvM]

I assume maximum achievable delay is longer than the expectable processor lifetime.
To be serious, it's a pure software problem.

 

[yassin.kraouch]

normally the value depend on the timer, right ? how can i know this value ? or how i have to calculate this value ?

 

[FvM]

There's more than one way to setup a software delay. You can use a hardware timer or just count instruction cycles by executing an empty for loop. Finally the delay can be scheduled multiple times in another loop, allowing effectively unlimited total delays. For the time being, it should be suffcient to know that it's feasible. You have to go into the msp430 (or whatever controller you'll use) coding details, you need a compiler and a programmer circuit for the respective device.

 

[yassin.kraouch]

yes you are right i have to go in details and start coding, i am curious to start coding,

 

[yassin.kraouch]

Hi FvM, i am looking to the possibility to change the uc with a smaller one, do you think that this uc can replace the one in the application note ? https://www.ti.com/lit/ds/symlink/msp430g2210.pdf ?

 

[FvM]

You didn't link an application note in this thread. I guess you mean the PIR switch AN mentioned here? https://www.edaboard.com/threads/304058/#post1301782

I don't understand if you want a trivial timer or the full PIR switch function? The latter uses a 16-bit ADC which might be required for full sensitivity. A software timer can be made by any µP.

 

[dilraj.n]

MSP430 software delay is available here
https://www.embeddedrelated.com/showcode/314.php