Datasheet

 1999-2013 Microchip Technology Inc. DS39026D-page 227
PIC18CXX2
TSTFSZ Test f, skip if 0
Syntax: [ label ] TSTFSZ f [,a]
Operands: 0  f  255
a  [0,1]
Operation: skip if f = 0
Status Affected: None
Encoding:
0110 011a ffff ffff
Description: If 'f' = 0, the next instruction,
fetched during the current instruc-
tion execution, is discarded and a
NOP is executed, making this a two-
cycle instruction. If ’a’ is 0, the
Access Bank will be selected, over-
riding the BSR value. If ’a’ is 1,
then the bank will be selected as
per the BSR value (default).
Words: 1
Cycles: 1(2)
Note: 3 cycles if skip and followed
by a 2-word instruction.
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
register 'f'
Process
Data
No
operation
If skip:
Q1 Q2 Q3 Q4
No
operation
No
operation
No
operation
No
operation
If skip and followed by 2-word instruction:
Q1 Q2 Q3 Q4
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
Example:
HERE TSTFSZ CNT, 1
NZERO :
ZERO :
Before Instruction
PC = Address(HERE)
After Instruction
If CNT = 0x00,
PC = Address (ZERO)
If CNT  0x00,
PC = Address (NZERO)
XORLW Exclusive OR literal with WREG
Syntax:
[ label ]
XORLW k
Operands: 0 k 255
Operation: (WREG) .XOR. k WREG
Status Affected: N,Z
Encoding:
0000 1010 kkkk kkkk
Description: The contents of WREG are
XORed with the 8-bit literal 'k'.
The result is placed in WREG.
Words: 1
Cycles: 1
Q Cycle Activity:
Q1 Q2 Q3 Q4
Decode Read
literal 'k'
Process
Data
Write to
WREG
Example:XORLW0xAF
Before Instruction
WREG = 0xB5
After Instruction
WREG = 0x1A