PIC18F6525_13 Datasheet, PDF (315/400 Pages) Microchip Technology – 64/80-Pin High-Performance, 64-Kbyte Enhanced Flash Microcontrollers with A/D

PIC18F6525/6621/8525/8621
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 instruction execution
is discarded and a NOP is executed,
making this a two-cycle instruction. If ‘a’
is ‘0’, the Access Bank will be selected,
overriding 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
Decode
Read
register ‘f’
Process
Data
If skip:
Q1
Q2
Q3
No
operation
No
operation
No
operation
If skip and followed by 2-word instruction:
Q1
Q2
Q3
No
operation
No
operation
No
operation
No
operation
No
operation
No
operation
Q4
No
operation
Q4
No
operation
Q4
No
operation
No
operation
Example:
HERE
NZERO
ZERO
TSTFSZ CNT, 1
:
:
Before Instruction
PC
=
After Instruction
If CNT =
PC =
If CNT 
PC =
Address (HERE)
0x00,
Address (ZERO)
0x00,
Address (NZERO)
XORLW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Q1
Decode
Exclusive OR Literal with W
[ label ] XORLW k
0 k 255
(W) .XOR. k W
N, Z
0000 1010 kkkk kkkk
The contents of W are XORed with
the 8-bit literal ‘k’. The result is placed
in W.
1
1
Q2
Read
literal ‘k’
Q3
Process
Data
Q4
Write to
W
Example:
XORLW
Before Instruction
W = 0xB5
After Instruction
W = 0x1A
0xAF
 2003-2013 Microchip Technology Inc.
DS39612C-page 315