Texas Instruments MSP50C614 User Manual
Page 225
Individual Instruction Descriptions
4-133
Assembly Language Instructions
4.14.39
MULS
Multiply String With No Data Transfer
Syntax
[label]
name
src
Clock,
clk
Word,
w
With RPT,
clk
Class
MULS
A
n [~]
n
S
+3
1
n
R
+3
3
Execution
PH,PL
⇐
MR *
src string
PC
⇐
PC + 1
Flags Affected
None
Opcode
Instructions
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MULS A
n[~]
1
1
1
0
0
1
1
A
n
1
1
1
1
0
0
A~
0
Description
Multiply MR and the value in
src. The 16 MSBs of the ( (n
s
+3) x 16 ) –bit product
are stored in the PH register. The value in
src is unchanged and the value in
PL is ignored. This instruction rounds the upper 16 bits. Note that A
n is a string
of length n
S
+2, where n
S
is the value in STR register.
See
Also
MUL, MULR, MULAPL, MULSPL, MULSPLS, MULTPL, MULTPLS,
MULAPL
Example 4.14.39.1
MULS A0
Multiply MR with A0 and store the upper 16 bits (with rounding) to PH register.