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Guest
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| PIC16F636 wrong bank switch |
 Posted: Wed Feb 23, 2005 5:17 am |
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This is the copy of the list file at the very begining of my program using 16F636
[list] ROM used: 915 words (45%)
Largest free fragment is 1133
RAM used: 15 (12%) at main() level
21 (16%) worst case
Stack: 3 worst case (2 in main + 1 for interrupts)
*
0000: MOVLW 00
0001: MOVWF 0A
0002: GOTO 031
0003: NOP
0004: MOVWF 7F
0005: SWAPF 03,W
0006: CLRF 03
0007: MOVWF 23
0008: MOVF 7F,W
0009: MOVWF 22
000A: MOVF 0A,W
000B: MOVWF 27
000C: CLRF 0A
000D: SWAPF 22,F
000E: MOVF 04,W
000F: MOVWF 24
0010: MOVF 20,W
0011: MOVWF 25
0012: MOVF 21,W
0013: MOVWF 26
0014: BCF 03.7
0015: BCF 03.5
0016: BTFSS 0B.4
0017: GOTO 01A
0018: BTFSC 0B.1
0019: GOTO 258
001A: MOVLW 8C
001B: MOVWF 04
001C: BTFSS 00.0
001D: GOTO 020
001E: BTFSC 0C.0
001F: GOTO 25B
0020: BTFSS 0B.5
0021: GOTO 024
0022: BTFSC 0B.2
0023: GOTO 25E
0024: MOVF 24,W
0025: MOVWF 04
0026: MOVF 25,W
0027: MOVWF 20
0028: MOVF 26,W
0029: MOVWF 21
002A: MOVF 27,W
002B: MOVWF 0A
002C: SWAPF 23,W
002D: MOVWF 03
002E: SWAPF 7F,F
002F: SWAPF 7F,W
0030: RETFIE
0031: MOVLW 07
0032: MOVWF 0A
0033: CALL 7FF
0034: BSF 03.5
0035: MOVWF 10
0036: MOVLW 00
0037: MOVWF 0A
0038: GOTO 370[/list][/b]
in the row 34. compiler set wrong bank and my program after row 38. jump to 770 instead of 370 using CCS Version 3.212
If any solution I would be 
HUNLaci |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Feb 23, 2005 1:29 pm |
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Can you post a short program that demonstrates that bug ?
I'll test it with 3.219 and see if CCS fixed it in that version. |
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Guest
Guest
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| Posted: Thu Feb 24, 2005 2:09 am |
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The simplest code produce the effect:
| Code: | #include <16F636.h>
#use delay(clock=4000000)
#fuses NOWDT,INTRC_IO, NOPROTECT, NOCPD, MCLR, NOIESO, PUT, NOFCMEN, NOWURE, NOBROWNOUT
#int_TIMER0
TIMER0_isr()
{
}
void main()
{
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
enable_interrupts(INT_TIMER0);
enable_interrupts(GLOBAL);
while(1){
}
} |
HUNLaci |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Feb 24, 2005 2:47 am |
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Here's the code for main() that's produced by PCM vs. 3.219. This would
correspond to the code in your program, at addresses 0x31 to 0x38.
Notice that the new code doesn't try to call 0x7FF. That's because in
version 3.212, I think that CCS was confused about the internal oscillator.
They are trying to read the OSCCAL value, as in the 12F675, but the
16F636 doesn't have an OSCCAL register. The data sheet says the
oscillator is "factory tuned" which might mean that it's laser trimmed,
or something like that. Anyway, in 3.219, they have fixed that bug.
| Code: |
// Code produced by vs. 3.219:
.................... void main()
.................... {
002A: CLRF 04 // Clear FSR
002B: MOVLW 1F
002C: ANDWF 03,F // Clear the bank select bits.
002D: MOVLW 07 // Turn off the comparators
002E: MOVWF 19
002F: BSF 03.5
0030: MOVF 05,W // Read TRISA
0031: BCF 03.5
0032: MOVF 19,W // Read CMCON0
0033: BCF 0C.3 // Clear C1IF
.................... |
I looked a little bit closer at your complaint, and I don't think there's
a problem as you describe it. Line 34 is setting the RP0 bit. That
affects the RAM bank, not the program counter address. So it won't
affect the jump address. In lines 36 and 37, your program is moving
0x00 into PCLATH. So it should jump to the address specified in the
opcode, which is 0x370. Did you actually see it jump to 0x770 ?
I think it's possible that if you report the OSCCAL bug to CCS, they
might give you a 1-day extension of your download rights and let you
download vs. 3.219. You should email CCS tech support about it. |
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