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KaraMuraT
Joined: 16 May 2006
Posts: 65
Location: Ankara/Turkey
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| Correcting the timing with a new type of PIC: 18FXXJ90 |
 Posted: Thu Sep 10, 2009 8:38 am |
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[compiler version: 4.093]
[programmer: PICKit2]
[uController: 18F66J90]
Hi there,
As usual I'm putting myself in to the fire before all to get some more from my designs. But also as usual, this causes a lot of headaches.
I recently decided to use 18F66J90 for our new product because of it's features. (LCD, RTC, mTouch, 2 UARTs, considerably low power comparing with other J series, etc).
Right now I have 120 pieces of 18F66J90's but I can make them run only at 4 MHz. Normally #use delay(clock=16000000) should work fine, but not with this one. I'm pretty sure this is a bug of CCS.
So I tried couple of workarounds.
Manually set the oscillator, manually set the PLL. But none of them works perfectly. Here is the code:
As I was writing this post, my aim was to ask help but exactly at this point I tried the last option and voila, found it. It was the SCS bits of OSCTUNE SF Register. So here I'm writing the solution if anyone needs it.
| Code: |
/// Add this line to your fuse settings
#fuses INTRCPLL_IO
/// if you want to use RA6 pin as 4MHz clock source use this one instead
#fuses INTRCPLL
/// Add this line right after your fuse settings (assuming that you want to work with 16 MHz)
#use delay(clock=16000000)
/// Add these lines somewhere in the beginning of your executable code like right after the void main()
#byte OSCCON = 0xFD3
#bit PLLEN = 0xF9B.6
OSCCON = 0b01100000; /// 4MHz
PLLEN = 1; /// x 4 = 16 MHz |
Regards,
_________________
/// KMT
/// www.muratursavas.com |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Sep 10, 2009 1:04 pm |
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| Quote: |
#byte OSCCON = 0xFD3
#bit PLLEN = 0xF9B.6
OSCCON = 0b01100000; /// 4MHz
PLLEN = 1; /// x 4 = 16 MHz
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This program does the same thing as your code:
(Tested with vs. 4.093 and 4.099)
| Code: | #include <18F66J90.h>
#fuses INTRCPLL_IO, NOWDT
#use delay(clock=16M)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
//=====================================
void main()
{
setup_oscillator(OSC_4MHZ | OSC_PLL_ON);
while(1);
}
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Here's the .LST file:
| Code: |
.... setup_oscillator(OSC_4MHZ | OSC_PLL_ON);
0030: MOVLW 40
0032: MOVWF F9B // Set PLLEN bit
0034: MOVLW 60
0036: MOVWF FD3
0038: MOVF FD3,W
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In symbolic format:
| Code: |
.... setup_oscillator(OSC_4MHZ | OSC_PLL_ON);
0030: MOVLW 40
0032: MOVWF OSCTUNE // Set PLLEN bit
0034: MOVLW 60
0036: MOVWF OSCCON
0038: MOVF OSCCON,W
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KaraMuraT
Joined: 16 May 2006
Posts: 65
Location: Ankara/Turkey
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| Posted: Fri Sep 11, 2009 3:10 am |
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Thank you PCM Programmer,
I never tried setup_oscillator in this situation because my experience with setup oscillator never solved anything.
That means, I have to be open minded 
_________________
/// KMT
/// www.muratursavas.com |
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