PIC17C756A MICROCHIP [Microchip Technology], PIC17C756A Datasheet - Page 219

• Manufacturer Part Number: PIC17C756A
• Description: High-Performance 8-bit CMOS EPROM Microcontrollers with 10-bit A/D
• Manufacturer: MICROCHIP [Microchip Technology]

Syntax:
Operands:
Operation:
Status Affected:
Q Cycle Activity:
MULLW
Encoding:
Description:
Words:
Cycles:
Example:
2000 Microchip Technology Inc.
Before Instruction
After Instruction
Decode
Q1
WREG
PRODH
PRODL
WREG
PRODH
PRODL
Multiply Literal with WREG
[ label ]
0
(k x WREG)
None
An unsigned multiplication is carried
out between the contents of WREG
and the 8-bit literal ’k’. The 16-bit
result is placed in PRODH:PRODL
register pair. PRODH contains the
high byte.
WREG 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
MULLW
literal ’k’
Read
1011
Q2
=
=
=
=
=
=
k
255
0xE2
?
?
0xC4
0xAD
0x08
0xC4
MULLW
1100
Process
Data
Q3
PRODH:PRODL
kkkk
k
PRODH:
registers
PRODL
Write
Q4
kkkk
Syntax:
Operands:
Operation:
Status Affected:
Q Cycle Activity:
MULWF
Encoding:
Description:
Words:
Cycles:
Example:
Before Instruction
After Instruction
Decode
Q1
WREG
REG
PRODH
PRODL
WREG
REG
PRODH
PRODL
register ’f’
Multiply WREG with f
[ label ]
0
(WREG x f)
None
An unsigned multiplication is carried
out between the contents of WREG
and the register file location ’f’. The
16-bit result is stored in the
PRODH:PRODL register pair.
PRODH contains the high byte.
Both WREG 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.
1
1
MULWF
Read
0011
Q2
=
=
=
=
=
=
=
=
f
PIC17C7XX
255
0xC4
0xB5
?
?
0xC4
0xB5
0x8A
0x94
REG
MULWF
0100
Process
Data
Q3
PRODH:PRODL
DS30289B-page 219
ffff
f
registers
PRODH:
PRODL
Write
Q4
ffff