PIC16F84 |
BCF OPTION,PSA
BCF
OPTION,3 Prescaler assigned to TMR0
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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
1111:2
1:4
1:8
1:16
1:32
1:64
1:128
1:2561:1
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
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!!