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I don't understand assembler

 
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jjude



Joined: 12 Nov 2007
Posts: 37

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I don't understand assembler
PostPosted: Thu Feb 18, 2010 2:24 am     Reply with quote
PIC16F616
.................... setup_vref(VREF_HIGH|REFERENSSI);
0278: MOVLW 8C This I understand W = 8C
0279: MOVWF 19 This I understand W -> 19 (VRCON)

.................... setup_comparator(CP1_C3_VREF | CP1_OUT_ON_A2 | CP1_INVERT);
027A: MOVLW B7 This I understand W = B7
027B: MOVWF 1A This I understand W -> 1A (CM1CON0)
027C: CLRF 1B This I understand 1B = 00 (CM2CON0)
027D: CLRF 1C This I understand 1C = 00 (CM2CON1)
027F: BSF 03.5 ???? SET but what
0281: CLRF 1A 1A = 00 (CM1CON0) WHY????
0282: CLRF 19 19 = 00 (VRCON) WHY????
monsters_inc



Joined: 18 Jan 2010
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PostPosted: Thu Feb 18, 2010 2:36 am     Reply with quote
Hi.
027F: BSF 03.5 this switch to data memory bank 1(STATUS register bit 5 = 1)
0281: CLRF 1A SRCON1 = 0 (address = 80h+1Ah = 9Ah)
0282: CLRF 19 SRCON0 = 0 (address = 80h+19h = 99h)
Look at page 15 and 18 of datasheet for PIC16F616

Best regards.
jjude



Joined: 12 Nov 2007
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PostPosted: Thu Feb 18, 2010 3:23 am     Reply with quote
monsters_inc wrote:
Hi.
027F: BSF 03.5 this switch to data memory bank 1(STATUS register bit 5 = 1)
0281: CLRF 1A SRCON1 = 0 (address = 80h+1Ah = 9Ah)
0282: CLRF 19 SRCON0 = 0 (address = 80h+19h = 99h)
Look at page 15 and 18 of datasheet for PIC16F616

Best regards.

Okay.
But i need comparator 1 "hysteresis".

.................... setup_comparator(CP1_C3_VREF | CP1_OUT_ON_A2 | CP1_INVERT | CP1_HYST);
027A: MOVLW B7 I understand W = B7
027B: MOVWF 1A I understand W -> 1A (CM1CON0)
027C: CLRF 1B I understand 1B = 00 (CM2CON0)
027D: CLRF 1C I understand 1C = 00(CM2CON1)
027E: MOVLW 80 I understand W = 80
027F: BSF 03.5 I understand SET BANK 1
0280: MOVWF 1A I understand W -> 9A (SRCON1)
0281: CLRF 19 I understand 99 = 00 (SRCON0)

SRCON0 and 1 set LATCH, not HYSTERESIS.

But if hysteresis is enabled, CM2CON1 bit 3 must set "1".
setup_comparator(CP1_C3_VREF | CP1_OUT_ON_A2 | CP1_INVERT | CP1_HYST);
THIS NOT WORK??? PCWH4.099
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Feb 18, 2010 12:12 pm     Reply with quote
The generated ASM code appears to be buggy. You need to write
directly to the PIC registers as a work-around.
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