PIC18F2420/2520/4420/4520
TABLE 24-2: PIC18FXXXX INSTRUCTION SET (CONTINUED)
16-Bit Instruction Word
Mnemonic,
Operands
Status
Affected
Description
Cycles
Notes
MSb LSb
BIT-ORIENTED OPERATIONS
BCF
BSF
BTFSC
BTFSS
BTG
f, b, a Bit Clear f
f, b, a Bit Set f
f, b, a Bit Test f, Skip if Clear
f, b, a Bit Test f, Skip if Set
f, d, a Bit Toggle f
1
1
1001 bbba
1000 bbba
ffff
ffff
ffff
ffff
ffff
ffff None
ffff None
ffff None
ffff None
ffff None
1, 2
1, 2
3, 4
3, 4
1, 2
1 (2 or 3) 1011 bbba
1 (2 or 3) 1010 bbba
1
0111 bbba
CONTROL OPERATIONS
BC
BN
n
n
n
n
n
n
n
n
Branch if Carry
1 (2)
1 (2)
1 (2)
1 (2)
1 (2)
1 (2)
1 (2)
2
1110 0010
1110 0110
1110 0011
1110 0111
1110 0101
1110 0001
1110 0100
1101 0nnn
1110 0000
1110 110s
1111 kkkk
0000 0000
0000 0000
1110 1111
1111 kkkk
0000 0000
1111 xxxx
0000 0000
0000 0000
1101 1nnn
0000 0000
0000 0000
nnnn
nnnn
nnnn
nnnn
nnnn
nnnn
nnnn
nnnn
nnnn
kkkk
kkkk
0000
0000
kkkk
kkkk
0000
xxxx
0000
0000
nnnn
1111
0001
nnnn None
nnnn None
nnnn None
nnnn None
nnnn None
nnnn None
nnnn None
nnnn None
nnnn None
kkkk None
kkkk
Branch if Negative
Branch if Not Carry
Branch if Not Negative
Branch if Not Overflow
Branch if Not Zero
Branch if Overflow
Branch Unconditionally
Branch if Zero
Call Subroutine 1st word
2nd word
Clear Watchdog Timer
Decimal Adjust WREG
Go to Address 1st word
2nd word
BNC
BNN
BNOV
BNZ
BOV
BRA
BZ
n
n, s
1 (2)
2
CALL
CLRWDT
DAW
GOTO
—
—
n
1
1
2
0100 TO, PD
0111
C
kkkk None
kkkk
NOP
NOP
POP
PUSH
RCALL
RESET
RETFIE
—
—
—
—
n
No Operation
No Operation
1
1
1
1
2
1
2
0000 None
xxxx None
0110 None
0101 None
nnnn None
1111 All
4
Pop Top of Return Stack (TOS)
Push Top of Return Stack (TOS)
Relative Call
Software Device Reset
Return from Interrupt Enable
s
000s GIE/GIEH,
PEIE/GIEL
RETLW
RETURN
SLEEP
k
s
—
Return with Literal in WREG
Return from Subroutine
Go into Standby mode
2
2
1
0000 1100
0000 0000
0000 0000
kkkk
0001
0000
kkkk None
001s None
0011 TO, PD
Note 1: When a PORT register is modified as a function of itself (e.g., MOVF PORTB, 1, 0), the value used will be that value
present on the pins themselves. For example, if the data latch is ‘1’ for a pin configured as input and is driven low by an
external device, the data will be written back with a ‘0’.
2: If this instruction is executed on the TMR0 register (and where applicable, ‘d’ = 1), the prescaler will be cleared if
assigned.
3: If the Program Counter (PC) is modified or a conditional test is true, the instruction requires two cycles. The second
cycle is executed as a NOP.
4: Some instructions are two-word instructions. The second word of these instructions will be executed as a NOPunless the
first word of the instruction retrieves the information embedded in these 16 bits. This ensures that all program memory
locations have a valid instruction.
© 2008 Microchip Technology Inc.
DS39631E-page 271
MICROCHIP [ MICROCHIP ]
