PIC16F84A Instructions

PIC16F84A Instructions

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

	File name:	File No:	Comments:
	EECON1 EECON2 EEADR EEDATA FSR INDF INTCON OPTION PCL PORTA PORTB STATUS TRISA TRISB	equ 088h equ 089h equ 9 equ 8 equ 4 equ 0 equ 0Bh equ 081h equ 2 equ 5 equ 6 equ 3 equ 085h equ 086h	;EEPROM Control Register 1 ;EEPROM Control Register 2 ;EEPROM address Register ;EEPROM Data Register ;File Select Register ;INDIRECT file ;Interrupt and Timer bits ;Option Register ;Program Counter Low-bits ;Port A ;Port B ;Status Register ;Make Port A bits input or output ;Make Port B bits input or output

Bit name:	Bit No:	Comments and name of file holding the bit:
Carry DC EEIF f GIE RD RP0 Self T0IE T0IF W WR WREN Z	equ 0 equ 1 equ 4 equ 1 equ 7 equ 0 equ 5 equ 1 equ 5 equ 2 equ 0 equ 1 equ 2 equ 2	;Carry bit in Status file C=0=no carry-out ;Digit Carry in Status DC=0=no carry out from 4th low-order digit ;In EECON1 EEIF=1=The write operation completed ;Place the result of the operation in the file ;Global Interrupt Enable bit. In INTCON 0=Disables all interrupts ;In EECON1 Read Control bit ;In Status. Register Bank select RP0=clear=bank0 RP0=set=bank1 ;Store the result in the file ;In INTCON Timer0 Overflow Interrupt Enable bit ;In INTCON Timer0 Overflow Interrupt Flag bit ;Place the result in W ;In EECON1 Write Control bit ;In EECON1 EEPROM Write Enable bit ;Z in Status file. Zero flag=set=1 when result of operation is zero!!