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How to setup external secondary Low Power Osc?

 
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E_Blue



Joined: 13 Apr 2011
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How to setup external secondary Low Power Osc?
PostPosted: Mon Sep 30, 2019 1:00 pm     Reply with quote
CCS v5.078
PIC24FJ1024GB606 (TQFP)

I need to run Timer 1, not the core, from an external 32KHz low power crystal so I have a crystal on pins 47 and 48 (RC13/RC14) with 27pF capacitors to ground.

On the code...

Code:

set_tris_c(0b0110000000000000);
setup_timer1(TMR_EXTERNAL_SOSC|TMR_DIV_BY_1|TMR_CONTINUE_IDLE|TMR_SYNC,8192);//Crystal 32.768KHz


Also the fuse
Code:
#fuses SOSC_LOW


But there's no oscillation.
Do I need to setup something more?

Edit:
Seems like there's a bit in OSCCON register that need to be set to 1 but I don't know how to.
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Electric Blue
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Mon Sep 30, 2019 5:10 pm     Reply with quote
This thread discusses the correct fuse to use:
http://www.ccsinfo.com/forum/viewtopic.php?t=57383
Ttelmah



Joined: 11 Mar 2010
Posts: 19602

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PostPosted: Mon Sep 30, 2019 10:41 pm     Reply with quote
As a comment, you do not want SYNC, if this is going to be used when
the chip is in sleep mode. Since you have selected to run when IDLE,
it suggests you do. Understand that SYNC syncronises to the master
oscillator, which won't be available when 'IDLE'.....
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