Texas Instruments MSP50C614 User Manual
Page 228
Individual Instruction Descriptions
4-136
4.14.42
MULSPL
Multiply and Subtract PL From Accumulator
Syntax
[label]
name
dest, src [, mod]
Clock,
clk
Word,
w
With RPT,
clk
Class
MULSPL
A
n, {adrs}
Table 4–46
Table 4–46
1b
MULSPL
A
n[~], An[~] [, next A]
1
1
n
R
+3
3
Execution
[premodify AP if
mod specified]
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
MULSPL A
n, {adrs}
0
1
1
1
1
1
1
A
n
adrs
x
dma16 (for direct) or offset16 (long relative) [see section 4.13]
MULSPL A
n[~], An[~], [next A]
1
1
1
0
0
next A
A
n
1
1
0
0
0
0
A~
~A
Description
Perform multiplication of multiply register (MR) and value of
src. The 16 MSBs
of the 32-bit product are stored in the product high (PH) register. The 16 LSBs
of the product (contained in product low (PL) register) are subtracted from
dest. Certain restrictions apply to the use of this instruction when interrupts are
occuring in the background. See Section 4.8 for more details.
Syntax
Description
MULSPL {
adrs}
Multiply MR by RAM word, substract PL to A
n
MULSPL A
n[~], An[~] [, next A]
Multiply MR by An[~] word, substract PL to A
n[~]
See Also
MULSPLS, MULTPL, MULTPLS, MULAPL, MULAPLS
Example 4.14.42.1
MULSPL A0, *R3++
Multiply MR with the contents of R3, subtract PL from accumulator A0. and store result in accumulator
A0 post-increment. Post-increment R3 by 2.
Example 4.14.42.2
MULSPL A2, A2~, ––A
Predecrement accumulator pointer AP2. Multiply MR register to accumulator A2~, subtract PL from
accumulator A2, and store result to accumulator A2.