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deepakomanna
Joined: 06 Mar 2007
Posts: 92
Location: Pune,India
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| 16f684 osccal value reading problem |
 Posted: Mon Sep 17, 2007 1:16 am |
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Dear Sir,
here i am using 16f684, MPLAB 7.5 Ver. & CCS PCM C Compiler, Version 3.249, 34534.
here i want to read osccal value after programming the ic (code protect off)
but it is showing 0xff data at 2008 (osccal location) plz tell me how to read osccal value.
Also i checked my .lst file in this at the start up code it not adding the instruction to call the
osccal value.
| Quote: | But when i used 12f629 the compiler adding these instruction at the start up,
....
....
....
....
003B: RETFIE
003C: CALL 3FF
003D: BSF 03.5
003E: MOVWF 10
003F: MOVLW 00
0040: MOVWF 0A
0041: GOTO 218 |
Plz tell me how can add osccal value by using 16f684.
_________________
Thank You,
With Best Regards,
Deepak. |
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Ttelmah
Guest
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| Posted: Mon Sep 17, 2007 2:16 am |
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The 16F684, does not have an 'OSCCAL' value stored in the ROM.
On these chips, the oscillator is factory programmed to the specified frequency, and you can then use the 'OSCTUNE' register, to modify this by up to +/-12%. The factory calibration is independant of this register, and the chip doesn't have to load a value on bootup. Hence the compiler does not add any code for this, and there is no value for you to read.
Best Wishes |
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