ADDITIONAL INSTRUCTIONS ADDWF PCL,1 ADDWF 02,1 Alter the program counter to create a jump CLRF INDF,1 CLRF 00,1 Clear INDIRECT file INCF FSR,1 INCF 04,1 Increment the File Select Register INTCON address is either 0Bh or 8Bh - it is mapped at both locations. BCF INTCON,RBIF Clear RB<7:4> Port-change Interrupt flag BSF INTCON,RBIF Set RB<7:4> Port-change Interrupt flag BCF INTCON,RBIE Disables the Port-change Interrupt BSF INTCON,RBIE Enables the Port-change Interrupt BCF INTCON,INTE Disables the RB0/INT Interrupt BSF INTCON,INTE Enables the RB0/INT Interrupt BCF INTCON,T0IE Disables the TMR0 Interrupt BSF INTCON,T0IE Enables the TMR0 Interrupt BCF INTCON,EEIE Disables the EE write complete Interrupt BSF INTCON,EEIE Enables the EE write complete Interrupt BCF INTCON,GIE Disables all Interrupts BSF INTCON,GIE Enables all un-masked Interrupts OPTION address is 81h - use the word OPTION OPTION,0 OPTION,1 OPTION,2 Prescaler Rate Select Bits
Bit Value |
TMR0 Rate |
WDT Rate |
000 001 010 011 100 101 110 111 |
1:2 1:4 1:8 1:16 1:32 1:64 1:128 1:256 |
1:1 1:2 1:4 1:8 1:16 1:32 1:64 1:128 |
e:g: BSF OPTION,0 BCF OPTION,1 BSF OPTION,2 TMR0 Rate = 1:64 WDT Rate = 1:32 BSF OPTION,0 BSF OPTION,1 BSF OPTION,2 TMR0 Rate = 1:256 WDT Rate = 1:128 |
BCF OPTION,PSA BCF OPTION,3 Prescaler assigned to TMR0 BSF OPTION,PSA BSF OPTION,3 Prescaler assigned to the WDT BCF OPTION,T0SE BCF OPTION,4 Increment on low-to-high on RA4/T0CKI pin BSF OPTION,T0SE BSF OPTION,4 Increment on high-to-low on RA4/T0CKI pin BCF OPTION,T0CS BCF OPTION,5 Internal Instruction cycle clock (CLKOUT) BSF OPTION,T0CS BSF OPTION,5 Clock source select. Transition on RA4/T0CKI Pin BCF OPTION,INTEDG BCF OPTION,6 Interrupt on falling edge of RB0/INT Pin BSF OPTION,INTEDG BSF OPTION,6 Interrupt on rising edge of RB0/INT Pin BCF OPTION,RBPU BCF OPTION,7 PORT B Pull-ups are enabled BSF OPTION,RBPU BSF OPTION,7 PORT B Pull-ups are disabled STATUS address is either 03h or 83h - it is mapped at both locations. BTFSS STATUS,C or BTFSC 03,0 Test the carry bit. C=1=set = carry occurred BTFSS STATUS,C or BTFSC 03,0 Test the carry bit. C=0=reset = carry did not occur BTFSS STATUS,DC BTFSS 03,1 Test the digit carry bit. C=1=set = carry-out from the 4th lower order bit of the result occurred. BTFSS STATUS,DC BTFSS 03,1 Test the digit carry bit. C=0=reset = carry-out did not occur from the 4th lower order bit of the result. BTFSS STATUS,Z or BTFSC 03,2 Test the zero bit. Z=1=set = result of arithmetic or logic operation is zero. BTFSS STATUS,Z or BTFSC 03,2 Test the zero bit. Z=0=reset = result of arithmetic or logic operation is not zero. BSF STATUS,RP0 BSF 03,5 Go to Bank1 for TRISA or TRISB register BCF STATUS,RP0 BCF 03,5 Go to Bank0 for programming CLRF INDF,1 CLRF 00,1 Clear INDIRECT file RETFIE Return from Interrupt Sets INTCON,GIE |