Texas Instruments TMS320C2XX User Manual
Page 267
MPY
Multiply
7-114
Cycles for a Single MPY Instruction (Using Direct and Indirect Addressing)
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 MPY Instruction (Using Direct
and Indirect Addressing)
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
Cycles for a Single MPY Instruction (Using Short Immediate Addressing)
ROM
DARAM
SARAM
External
1
1
1
1+p
Example 1
MPY
DAT13
;(DP = 8)
Before Instruction
After Instruction
Data Memory
Data Memory
40Dh
7h
40Dh
7h
TREG
6h
TREG
6h
PREG
36h
PREG
2Ah
Cycles