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PIC16F84A Instructions

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!!

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