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PIC17C752-08/P Datasheet(PDF) 205 Page - Microchip Technology

Part # PIC17C752-08/P
Description  High-Performance 8-Bit CMOS EPROM Microcontrollers
PDF  320 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC17C752-08/P Datasheet(HTML) 205 Page - Microchip Technology

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© 1997 Microchip Technology Inc.
DS30264A-page 205
PIC17C75X
MULLW
Multiply Literal with WREG
Syntax:
[
label ]
MULLW
k
Operands:
0
≤ k ≤ 255
Operation:
(k x WREG)
→ PRODH:PRODL
Status Affected:
None
Encoding:
1011
1100
kkkk
kkkk
Description:
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.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
literal 'k'
Process
Data
Write
registers
PRODH:
PRODL
Example:
MULLW
0xC4
Before Instruction
WREG
=
0xE2
PRODH
=
?
PRODL
=
?
After Instruction
WREG
=
0xC4
PRODH
=
0xAD
PRODL
=
0x08
MULWF
Multiply WREG with f
Syntax:
[
label ]
MULWF
f
Operands:
0
≤ f ≤ 255
Operation:
(WREG x f)
→ PRODH:PRODL
Status Affected:
None
Encoding:
0011
0100
ffff
ffff
Description:
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.
Words:
1
Cycles:
1
Q Cycle Activity:
Q1
Q2
Q3
Q4
Decode
Read
register 'f'
Process
Data
Write
registers
PRODH:
PRODL
Example:
MULWF
REG
Before Instruction
WREG
=
0xC4
REG
=
0xB5
PRODH
=
?
PRODL
=
?
After Instruction
WREG
=
0xC4
REG
=
0xB5
PRODH
=
0x8A
PRODL
=
0x94



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