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© 2006 Microchip Technology Inc.
DS41159E-page 289
PIC18FXX8
ANDWF
AND W with f
Syntax:
[
label
] ANDWF f [,d [,a]]
Operands:
0
≤ f ≤ 255
d
∈ [0,1]
a
∈ [0,1]
Operation:
(W) .AND. (f)
→ dest
Status Affected:
N, Z
Encoding:
0001
01da
ffff
ffff
Description:
The contents of W are ANDed with
register ‘f’. If ‘d’ is ‘0’, the result is stored
in W. If ‘d’ is ‘1’, the result is stored back
in register ‘f’ (default). If ‘a’ is ‘0’, the
Access Bank will be selected. If ‘a’ is ‘1’,
the BSR will not be overridden (default).
register ‘f’. If ‘d’ is ‘0’, the result is stored
in W. If ‘d’ is ‘1’, the result is stored back
in register ‘f’ (default). If ‘a’ is ‘0’, the
Access Bank will be selected. If ‘a’ is ‘1’,
the BSR will not be overridden (default).
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ‘f’
Process
Data
Write to
destination
Example:
ANDWF
REG,
W
Before Instruction
W
=
0x17
REG
=
0xC2
After Instruction
W
=
0x02
REG
=
0xC2
BC
Branch if Carry
Syntax:
[
label
] BC n
Operands:
-128
≤ n ≤ 127
Operation:
if Carry bit is ‘1’
(PC) + 2 + 2n
(PC) + 2 + 2n
→ PC
Status Affected:
None
Encoding:
1110
0010
nnnn
nnnn
Description:
If the Carry bit is ‘1’, then the program
will branch.
The 2’s complement number ‘2n’ is
added to the PC. Since the PC will have
incremented to fetch the next instruc-
tion, the new address will be
PC + 2 + 2n. This instruction is then a
two-cycle instruction.
will branch.
The 2’s complement number ‘2n’ is
added to the PC. Since the PC will have
incremented to fetch the next instruc-
tion, the new address will be
PC + 2 + 2n. This instruction is then a
two-cycle instruction.
Words:
1
Cycles:
1(2)
Q Cycle Activity:
If Jump:
If Jump:
Q1
Q2
Q3
Q4
Decode
Read literal
‘n’
Process
Data
Write to PC
No
operation
No
operation
No
operation
No
operation
If No Jump:
Q1
Q2
Q3
Q4
Decode
Read literal
‘n’
Process
Data
No
operation
Example:
HERE
BC
JUMP
Before Instruction
PC
=
address (HERE)
After Instruction
If Carry
=
1;
PC
= address (JUMP)
If Carry
=
0;
PC
= address
(HERE + 2)