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24th November 2005, 03:05 AM
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 pic low power problems Hello! I am having problems putting a pic 12f629 into low-power mode. Before the sleep command the power consumption is 540ua and afterwards it is 47ua (so I think it is actually getting the sleep command. ) Sleep current should be 4ua...or am I misreading something? I have nothing connected to any pins other then 3 volts + and - on vdd and vcc I have written my code in pic simulator’s basic compiler. Following is the code. Code: TRISIO = %000000 Dim count2 As Word count2 = 0 start: GPIO = %111000 WaitMs 10 GPIO = %000111 WaitMs 10 If count2 > 20 Then 'should be 16000 count2 = 0 GPIO = %000000 WaitMs 5000 ASM: sleep Else count2 = count2 + 1 Endif Goto start End Code: ; Begin R0L EQU 0x20 R0H EQU 0x21 R1L EQU 0x22 R1H EQU 0x23 R2L EQU 0x24 R2H EQU 0x25 R3L EQU 0x26 R3H EQU 0x27 R4L EQU 0x28 R4H EQU 0x29 R5L EQU 0x2A R5H EQU 0x2B ORG 0x0000 BCF PCLATH,3 BCF PCLATH,4 GOTO L0002 ORG 0x0004 RETFIE L0002: ; 1: 'INTCON.GPIE = 1 'enable b0 int. ; 2: 'INTCON.GIE = True 'enable all un-masked interrupts ; 3: TRISIO = %000000 BSF STATUS,RP0 CLRF 0x05 BCF STATUS,RP0 ; 4: Dim count2 As Word ; The address of 'count2' is 0x2C count2 EQU 0x2C ; 5: count2 = 0 CLRF 0x2C CLRF 0x2D ; 6: ; 7: ; 8: start: L0001: ; 9: GPIO = %111000 MOVLW 0x38 MOVWF 0x05 ; 10: WaitMs 10 MOVLW 0x0A MOVWF R0L CLRF R0H CALL W001 ; 11: GPIO = %000111 MOVLW 0x07 MOVWF 0x05 ; 12: WaitMs 10 MOVLW 0x0A MOVWF R0L CLRF R0H CALL W001 ; 13: ; 14: If count2 > 20 Then 'should be 16000 MOVF 0x2C,W MOVWF R0L MOVF 0x2D,W MOVWF R0H CLRF R1H MOVLW 0x14 CALL C003 BTFSS STATUS,Z GOTO L0003 ; 15: count2 = 0 CLRF 0x2C CLRF 0x2D ; 16: GPIO = %000000 CLRF 0x05 ; 17: WaitMs 5000 MOVLW 0x88 MOVWF R0L MOVLW 0x13 MOVWF R0H CALL W001 ; 18: ASM: sleep sleep ; 19: Else GOTO L0004 L0003: MOVLW 0x1F ANDWF STATUS,F ; 20: count2 = count2 + 1 MOVF 0x2C,W ADDLW 0x01 MOVWF 0x2C MOVF 0x2D,W BTFSC STATUS,C ADDLW 0x01 ADDLW 0x00 MOVWF 0x2D ; 21: Endif L0004: MOVLW 0x1F ANDWF STATUS,F ; 22: Goto start GOTO L0001 ; 23: ; 24: ; 25: ; 26: ; 27: ; 28: ; 29: End L0005: GOTO L0005 ; 30: ; 31: 'On Interrupt ; 32: 'count2 = 0 ; 33: ; 34: 'INTCON.GPIF = 0 ; 35: 'Resume ; 36: ; 37: ; End of program L0006: GOTO L0006 ; Comparison Routine C001: MOVWF R1L MOVLW 0x05 GOTO C007 C002: MOVWF R1L MOVLW 0x02 GOTO C007 C003: MOVWF R1L MOVLW 0x06 GOTO C007 C004: MOVWF R1L MOVLW 0x03 GOTO C007 C005: MOVWF R1L MOVLW 0x04 GOTO C007 C006: MOVWF R1L MOVLW 0x01 GOTO C007 C007: MOVWF R4L MOVF R1H,W SUBWF R0H,W BTFSS STATUS,Z GOTO C008 MOVF R1L,W SUBWF R0L,W C008: MOVLW 0x04 BTFSC STATUS,C MOVLW 0x01 BTFSC STATUS,Z MOVLW 0x02 ANDWF R4L,W BTFSS STATUS,Z MOVLW 0xFF RETURN ; Waitms Routine W001: MOVF R0L,F BTFSC STATUS,Z GOTO W002 CALL W003 DECF R0L,F NOP NOP NOP NOP NOP GOTO W001 W002: MOVF R0H,F BTFSC STATUS,Z RETURN CALL W003 DECF R0H,F DECF R0L,F GOTO W001 W003: MOVLW 0x0C MOVWF R2H W004: DECFSZ R2H,F GOTO W004 NOP NOP MOVLW 0x12 MOVWF R1L W005: DECFSZ R1L,F GOTO W006 CALL W007 CALL W007 NOP NOP RETURN W006: CALL W007 GOTO W005 W007: MOVLW 0x0D MOVWF R2L W008: DECFSZ R2L,F GOTO W008 NOP RETURN ; End of listing END | |
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24th November 2005, 07:11 AM
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| Checkout the PIC12F629 datasheet. Each module's power consumption is listed on the DC characteristics page. You may have to turn OFF some of the modules to get the lowest power consumption. For example, BOD and the watchdog timer should be disabled in the configuration fuses. You don't need brown-out detection because that could wake the device out of sleep should the voltage drop below brown-out level. Same is true with the watchdog timer. In addition, set all pins to input so none of them will source while sleeping. This should have been posted under microcontrollers section.
__________________ "Having to do with Motion Control" | |
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Linear Mode
