Texas Instruments MSP50C6xx User Manual
Page 225
Individual Instruction Descriptions
4-139
Assembly Language Instructions
4.14.44
MULSPLS
Multiply String and Subtract PL From Accumulator
Syntax
[label]
name
dest, src
Clock, clk
Word, w
With RPT, clk
Class
MULSPLS
An, {adrs}
Table 4–46
Table 4–46
1b
MULSPLS
An[~], An[~]
n
S
+3
1
n
R
+3
3
Execution
PH,PL
⇐
MR * src
dest
⇐
dest – PL
PC
⇐
PC + 1
Flags Affected
OF, SF, ZF, CF are set accordingly
src is {adrs}:
TAG bit is set accordingly
Opcode
Instructions
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MULSPLS An, {adrs}
0
1
1
1
1
1
1
An
adrs
x
dma16 (for direct) or offset16 (long relative) [see section 4.13]
MULSPL S An[~], An[~]
1
1
1
0
0
1
1
An
1
1
0
0
0
0
A~
~A
Description
Perform multiplication of multiply register (MR) and value of src. The 16 MSBs
of the ((n
s
+ 3)
×
16)-bit product are stored in the product high (PH) register.
The 16 LSBs of the product (contained in product low (PL) register) subtracted
from dest string.
Syntax
Description
MULSPLS {adrs}
Multiply MR by data memory string, subtract PL from An
MULSPLS An[~], An[~]
Multiply MR by An[~] string, subtract PL from An[~]
See Also
MULSPL, MULTPL, MULTPLS, MULAPL, MULAPLS
Example 4.14.44.1
MULSPLS A0, *R3++
Multiply MR with the contents of R3, subtract PL from accumulator string A0, and store result in
accumulator string A0. Increment R3 by 2.
Example 4.14.44.2
MULSPLS A2, A2~
Multiply MR register to accumulator string A2~, subtract PL from accumulator string A2, and store result
to accumulator string A2.