
PIC17C4X
DS30412C-page 112
1996 Microchip Technology Inc.
ADDLW
ADD Literal to WREG
Syntax:
[
label ] ADDLW
k
Operands:
0
≤ k ≤ 255
Operation:
(WREG) + k
→ (WREG)
Status Affected:
OV, C, DC, Z
Encoding:
1011
0001
kkkk
Description:
The contents of WREG are added to the
8-bit literal 'k' and the result is placed in
WREG.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
literal 'k'
Execute
Write to
WREG
Example:
ADDLW
0x15
Before Instruction
WREG = 0x10
After Instruction
WREG = 0x25
ADDWF
ADD WREG to f
Syntax:
[
label ] ADDWF
f,d
Operands:
0
≤ f ≤ 255
d
∈ [0,1]
Operation:
(WREG) + (f)
→ (dest)
Status Affected:
OV, C, DC, Z
Encoding:
0000
111d
ffff
Description:
Add WREG to register 'f'. If 'd' is 0 the
result is stored in WREG. If 'd' is 1 the
result is stored back in register 'f'.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register 'f'
Execute
Write to
destination
Example:
ADDWF
REG,
0
Before Instruction
WREG
=
0x17
REG
=
0xC2
After Instruction
WREG
=
0xD9
REG
=
0xC2