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PIC18F2455_07 Datasheet, PDF (349/430 Pages) Microchip Technology – 28/40/44-Pin, High Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology | |||
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PIC18F2455/2550/4455/4550
TSTFSZ
Test f, Skip if 0
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
TSTFSZ f {,a}
0 ⤠f ⤠255
a â [0,1]
skip if f = 0
None
0110 011a ffff ffff
If âfâ = 0, the next instruction fetched
during the current instruction execution
is discarded and a NOP is executed,
making this a two-cycle instruction.
If âaâ is â0â, the Access Bank is selected.
If âaâ is â1â, the BSR is used to select the
GPR bank (default).
If âaâ is â0â and the extended instruction
set is enabled, this instruction operates
in Indexed Literal Offset Addressing
mode whenever f ⤠95 (5Fh). See
Section 26.2.3 âByte-Oriented and
Bit-Oriented Instructions in Indexed
Literal Offset Modeâ for details.
Words:
Cycles:
1
1(2)
Note: 3 cycles if skip and followed
by a 2-word instruction.
Q Cycle Activity:
Q1
Q2
Q3
Decode
Read
register âfâ
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
â
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 â W
N, Z
0000 1010 kkkk kkkk
The contents of W are XORed with
the 8-bit literal âkâ. The result is placed
in W.
1
1
Q2
Read
literal âkâ
Q3
Process
Data
Q4
Write to W
Example:
XORLW
Before Instruction
W
= B5h
After Instruction
W
= 1Ah
0AFh
© 2007 Microchip Technology Inc.
Preliminary
DS39632D-page 347
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