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dyeatman
Joined: 06 Sep 2003
Posts: 1934
Location: Norman, OK
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 Posted: Fri Jan 14, 2011 8:50 am |
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I am using the ICD-U64 with an 18F46K22 and it reports I am running at 1MHZ even though I have verified I am running at 64MHZ using a scope.
As Ttelmah said earlier, try using setup_oscillator(). From the header:
| Code: |
////////////////////////////////////////////////////////////////// INTERNAL RC
// Constants used in setup_oscillator() are:
// First param:
#define OSC_31KHZ 0
#define OSC_125KHZ 0x10
#define OSC_250KHZ 0x20
#define OSC_500KHZ 0x30
#define OSC_1MHZ 0x40
#define OSC_2MHZ 0x50
#define OSC_4MHZ 0x60
#define OSC_8MHZ 0x70
#define OSC_16MHZ 0x4060
#define OSC_32MHZ 0x4070
// The following may be OR'ed in with the above using |
#define OSC_TIMER1 1
#define OSC_INTRC 2
#define OSC_NORMAL 0
// The following may be OR'ed in with the above using |
#define OSC_IDLE_MODE 0x80
#define OSC_31250 0x8000
#define OSC_PLL_ON 0x4000
#define OSC_PLL_OFF 0
// A second optional parameter may be used with this part to fine
// tune the speed (signed int,0-31)
// Result may be (ignore all other bits)
#define OSC_STATE_STABLE 4
#define OSC_STATE_EXT_RUNNING 8
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tonymcc
Joined: 27 Jul 2010
Posts: 15
Location: Northampton UK Home of the 'Big Sheds'
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| Thanks dyeatman |
| Posted: Fri Jan 14, 2011 9:25 am |
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I must be going blind to have missed this section in the processor header and not associate with OSCCON in the data sheet. I have tried now using setup_oscillator(OSC_INTRC | OSC_8MHZ);
but still get my 2MHz at pin 14. Well, it is Friday, thanks very much for your advice. |
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dyeatman
Joined: 06 Sep 2003
Posts: 1934
Location: Norman, OK
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| Posted: Fri Jan 14, 2011 9:35 am |
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From the datasheet:
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2.6.1 INTIO MODES
Using the internal oscillator as the clock source
eliminates the need for up to two external oscillator
pins, which can then be used for digital I/O. Two distinct
configurations are available:
• In INTIO1 mode, the OSC2 pin outputs FOSC/4,
while OSC1 functions as RA7 for digital input and
output.
• In INTIO2 mode, OSC1 functions as RA7 and
OSC2 functions as RA6, both for digital input and
output. |
So 8MHZ/4=2MHZ is correct on pin 14.
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tonymcc
Joined: 27 Jul 2010
Posts: 15
Location: Northampton UK Home of the 'Big Sheds'
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| Posted: Fri Jan 14, 2011 9:41 am |
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| Thanks again. You are, of course, correct. So, my original #fuse INTRC plus the #use_delay(clock=8000000) directive did work, I just misinterpreted the results. I checked with a few other frequencies and all is well. A learning day. |
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