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Multiply Unsigned
MPYU
7-121
Assembly Language Instructions
Cycles for a Single MPYU Instruction
Program
Operand ROM DARAM SARAM External
DARAM 1 1 1 1+p
SARAM 1 1 1, 2
†
1+p
External 1+d 1+d 1+d 2+d+p
†
If the operand and the code are in the same SARAM block
Cycles for a Repeat (RPT) Execution of an MPYU Instruction
Program
Operand ROM DARAM SARAM External
DARAM n n n n+p
SARAM n n n, n+1
†
n+p
External n+nd n+nd n+nd n+1+p+nd
†
If the operand and the code are in the same SARAM block
Example 1 MPYU 16 ;(DP = 4: addresses 0200h–027Fh)
Before Instruction After Instruction
Data Memory Data Memory
210h 0FFFFh 210h 0FFFFh
TREG 0FFFFh TREG 0FFFFh
PREG 1h PREG 0FFFE0001h
Example 2 MPYU *,AR6
Before Instruction After Instruction
ARP 5 ARP 6
AR5 210h AR5 210h
Data Memory Data Memory
210h 0FFFFh 210h 0FFFFh
TREG 0FFFFh TREG 0FFFFh
PREG 1h PREG 0FFFE0001h
Cycles