PIC18F258 MICROCHIP [Microchip Technology], PIC18F258 Datasheet - Page 306
PIC18F258
Manufacturer Part Number
PIC18F258
Description
High Performance, 28/40-Pin Enhanced FLASH Microcontrollers with CAN
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F258.pdf
(384 pages)
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PIC18FXX8
MULLW
Syntax:
Operands:
Operation:
Status Affected:
Encoding:
Description:
Words:
Cycles:
Example:
DS41159B-page 304
Q Cycle Activity:
Before Instruction
After Instruction
Decode
W
PRODH
PRODL
W
PRODH
PRODL
Q1
literal ’k’
Multiply Literal with W
[ label ]
0
(W) x k
None
An unsigned multiplication is car-
ried 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 opera-
tion. A zero result is possible, but
not detected.
1
1
MULLW
Read
0000
Q2
=
=
=
=
=
=
k
255
0xE2
?
?
0xE2
0xAD
0x08
0xC4
MULLW
PRODH:PRODL
1101
Process
Data
Q3
kkkk
k
PRODH:
registers
PRODL
Write
Q4
kkkk
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
[ label ]
0
a
(W) x (f)
None
An unsigned multiplication is car-
ried 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 opera-
tion. 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).
1
1
MULWF
Read
0000
Q2
=
=
=
=
=
=
=
=
f
[0,1]
2002 Microchip Technology Inc.
255
0xC4
0xB5
?
?
0xC4
0xB5
0x8A
0x94
REG
MULWF
001a
PRODH:PRODL
Process
Data
Q3
ffff
f [,a]
PRODH:
registers
PRODL
Write
Q4
ffff
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