PIC18F2420 MICROCHIP [Microchip Technology], PIC18F2420 Datasheet - Page 296

• Manufacturer Part Number: PIC18F2420
• Description: 28/40/44-Pin Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F2420/2520/4420/4520
MULLW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
DS39631A-page 294
Q Cycle Activity:
Before Instruction
After Instruction
Decode
W
PRODH
PRODL
W
PRODH
PRODL
Q1
Multiply literal with W
MULLW
0
(W) x k
None
An unsigned multiplication is carried
out between the contents of W and the
8-bit literal ‘k’. The 16-bit result is
placed in the PRODH:PRODL register
pair. PRODH contains the high byte.
W is unchanged.
None of the Status flags are affected.
Note that neither overflow nor carry is
possible in this operation. A zero result
is possible but not detected.
1
1
literal ‘k’
MULLW
Read
0000
Q2
=
=
=
=
=
=
k
255
E2h
?
?
E2h
ADh
08h
PRODH:PRODL
k
0C4h
1101
Process
Data
Q3
kkkk
registers
PRODH:
PRODL
Write
Q4
kkkk
Preliminary
MULWF
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
Q Cycle Activity:
Before Instruction
After Instruction
Decode
W
REG
PRODH
PRODL
W
REG
PRODH
PRODL
Q1
register ‘f’
Multiply W with f
MULWF
0
a
(W) x (f)
None
An unsigned multiplication is carried
out between the contents of W and the
register file location ‘f’. The 16-bit
result is stored in the PRODH:PRODL
register pair. PRODH contains the
high byte. Both W and ‘f’ are
unchanged.
None of the Status flags are affected.
Note that neither overflow nor carry is
possible in this operation. A zero
result is possible but not detected.
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
“Byte-Oriented and Bit-Oriented
Instructions in Indexed Literal Offset
Mode” for details.
1
1
MULWF
Read
Q2
0000
=
=
=
=
=
=
=
=
95 (5Fh). See Section 24.2.3
f
 2004 Microchip Technology Inc.
[0,1]
255
C4h
B5h
?
?
C4h
B5h
8Ah
94h
REG, 1
f {,a}
PRODH:PRODL
001a
Process
Data
Q3
ffff
registers
PRODH:
PRODL
Write
Q4
ffff