PIC18F2331_07 Datasheet, PDF (331/400 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with nanoWatt Technology, High Performance PWM and A/D

PIC18F2331/2431/4331/4431
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 TSTFSZ CNT
NZERO :
ZERO :
Before Instruction
PC = Address (HERE)
After Instruction
If CNT
PC
If CNT
PC
= 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 0xAF
Before Instruction
W
= 0xB5
After Instruction
W
= 0x1A
© 2007 Microchip Technology Inc.
Preliminary
DS39616C-page 329