PIC18F6520-I Datasheet, PDF (288/380 Pages) Micrel Semiconductor – 64/80-Pin High-Performance, 256 Kbit to 1 Mbit Enhanced Flash Microcontrollers with A/D

PIC18F6520/8520/6620/8620/6720/8720
MULLW
Multiply Literal with W
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
[ label ] MULLW k
0 ≤ k ≤ 255
(W) x k → PRODH:PRODL
None
0000 1101 kkkk kkkk
An unsigned multiplication is
carried out between the contents
of W and the 8-bit literal ‘k’. The
16-bit result is placed in
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.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Decode
Q2
Read
literal ‘k’
Q3
Process
Data
Q4
Write
registers
PRODH:
PRODL
Example:
MULLW 0xC4
Before Instruction
W
=
PRODH
=
PRODL
=
After Instruction
0xE2
?
?
W
PRODH
PRODL
= 0xE2
= 0xAD
= 0x08
MULWF
Multiply W with f
Syntax:
[ label ] MULWF f [,a]
Operands:
0 ≤ f ≤ 255
a ∈ [0,1]
Operation:
(W) x (f) → PRODH:PRODL
Status Affected: None
Encoding:
0000 001a ffff ffff
Description
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 will be
selected, overriding the BSR
value. If ‘a’= 1, then the bank will
be selected as per the BSR
value (default).
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register ‘f’
Process
Data
Write
registers
PRODH:
PRODL
Example:
MULWF REG, 1
Before Instruction
W
=
REG
=
PRODH
=
PRODL
=
After Instruction
W
=
REG
=
PRODH
=
PRODL
=
0xC4
0xB5
?
?
0xC4
0xB5
0x8A
0x94
DS39609B-page 286
 2004 Microchip Technology Inc.