PIC18F2682 Datasheet, PDF (405/484 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology

PIC18F2682/2685/4682/4685
TSTFSZ
Test f, Skip if 0
Syntax:
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 is selected.
If ‘a’ is ‘1’, the BSR is used to select the
GPR bank (default).
If ‘a’ is ‘0’ and the extended instruction
set is enabled, this instruction operates
in Indexed Literal Offset Addressing
mode whenever f ≤ 95 (5Fh). See
Section 25.2.3 “Byte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Mode” for details.
Words:
1
Cycles:
1(2)
Note: 3 cycles if skip and followed
by a 2-word instruction.
Q Cycle Activity:
Q1
Decode
Q2
Read
register ‘f’
Q3
Process
Data
Q4
No
operation
If skip:
Q1
Q2
Q3
Q4
No
operation
No
operation
No
operation
If skip and followed by 2-word instruction:
No
operation
Q1
No
operation
Q2
No
operation
Q3
No
operation
Q4
No
operation
No
operation
No
operation
No
operation
No
operation
Example:
HERE
NZERO
ZERO
TSTFSZ CNT, 1
:
:
Before Instruction
PC
=
After Instruction
If CNT
=
PC
=
If CNT
≠
PC
=
Address (HERE)
00h,
Address (ZERO)
00h,
Address (NZERO)
XORLW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Q Cycle Activity:
Q1
Decode
Exclusive OR Literal with W
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
= B5h
After Instruction
W
= 1Ah
0AFh
© 2007 Microchip Technology Inc.
Preliminary
DS39761B-page 403