Техническая Спецификация для Microchip Technology ARD00385
2009-2011 Microchip Technology Inc.
DS39957D-page 491
PIC18F87K90 FAMILY
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.
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.
If ‘a’ is ‘1’, the BSR is used to select the
GPR bank.
If ‘a’ is ‘0’ and the extended instruction
set is enabled, this instruction operates
in Indexed Literal Offset Addressing
mode whenever f
set is enabled, this instruction operates
in Indexed Literal Offset Addressing
mode whenever f
95 (5Fh). See
for details.
Words:
1
Cycles:
1(2)
Note:
Note:
3 cycles if skip and followed
by a 2-word instruction.
by a 2-word instruction.
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ‘f’
Process
Data
No
operation
If skip:
Q1
Q2
Q3
Q4
No
operation
No
operation
No
operation
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
=
00h,
PC =
Address (ZERO)
If CNT
00h,
PC =
Address
(NZERO)
XORLW
Exclusive OR Literal with W
Syntax:
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.
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
0AFh
Before Instruction
W
=
B5h
After Instruction
W
=
1Ah