2.2.39 (1) MULXU (B)
MULXU (MULtiply eXtend as Unsigned)
Multiply
Operation
Rd
×
Rs
→
Rd
Assembly-Language Format
MULXU.B
Rs, Rd
Operand Size
Byte
Condition Code
H: Previous value remains unchanged.
N: Previous value remains unchanged.
Z: Previous value remains unchanged.
V: Previous value remains unchanged.
C: Previous value remains unchanged.
I
UI
H
U
N
Z
V
C
—
—
—
—
—
—
—
—
Description
This instruction multiplies the lower 8 bits of a 16-bit register Rd (destination operand) by the
contents of an 8-bit register Rs (source operand) and stores the result in the 16-bit register Rd. If
Rd is a general register, Rs can be the upper part (RdH) or lower part (RdL) of Rd. The operation
performed is 8-bit
×
8-bit
→
16-bit multiplication.
Available Registers
Rd:
R0 to R7, E0 to E7
Rs:
R0L to R7L, R0H to R7H
Operand Format and Number of States Required for Execution
Notes
Rd
Rs
Rd
Don’t care Multiplicand
×
Multiplier
→
Product
8 bits
8 bits
16 bits
Instruction Format
1st byte
2nd byte
3rd byte
4th byte
Register direct
MULXU.B
Rs, Rd
5
0
rs
rd
14
No. of
States
Addressing
Mode
Mnemonic
Operands
130