PIC18FXX39 Datasheet, PDF (251/322 Pages) Microchip Technology – Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel

PIC18FXX39
TSTFSZ
Test f, skip if 0
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
[ label ] TSTFSZ f [,a]
0  f  255
a  [0,1]
skip if f = 0
None
0110 011a ffff ffff
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
Decode
Read
register 'f'
Q3
Process
Data
Q4
No
operation
If skip:
Q1
No
operation
Q2
No
operation
Q3
No
operation
Q4
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
PC
If CNT
PC
= 0x00,
= Address (ZERO)
 0x00,
= Address (NZERO)
XORLW
Exclusive OR literal with W
Syntax:
[ label ] XORLW k
Operands:
0 k 255
Operation:
(W) .XOR. k W
Status Affected: N, Z
Encoding:
0000 1010 kkkk kkkk
Description:
The contents of W are XORed
with the 8-bit literal 'k'. The result
is placed in W.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
literal 'k'
Process
Data
Write to W
Example:
XORLW 0xAF
Before Instruction
W
= 0xB5
After Instruction
W
= 0x1A
 2002-2013 Microchip Technology Inc.
Preliminary
DS30485B-page 251