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Individual Instruction Descriptions
4-140
4.14.45 MULTPL Multiply and Transfer PL to Accumulator
Syntax
[label] name dest, src [, mod] Clock, clk Word, w With RPT, clk Class
MULTPL An, {adrs} Table 4–46 Table 4–46 1b
MULTPL An[~], An[~] [, next A] 1 1 n
R
+3 3
Execution [premodify AP if mod specified]
PH,PL ⇐ MR * src
An ⇐ 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
MULTPL An, {adrs}
0 1 1 0 0 0 0 An adrs
x dma16 (for direct) or offset16 (long relative) [see section 4.13]
MULTPL An[~], An[~], [next A] 1 1 1 0 0 next A An 1 1 0 1 1 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 stored in An. Certain
restrictions apply to the use of this instruction when interrupts are occuring in
the background. See Section 4.8 for more detail.
Syntax Description
MULTPL {adrs} Multiply MR by data memory word, move PL to An
MULTPL An[~], An[~] [, next A] Multiply MR by An[~] word, move PL to An[~]
See Also MULTPLS, MULAPL, MULAPLS, MULSPL, MULSPLS
Example 4.14.45.1 MULTPL A0, *R3++
Multiply the contents of R3 with MR register and store PL in accumulator A0. Increment R3 by 2.
Example 4.14.45.2 MULTPL A2, A2~, ––A
Multiply MR register to accumulator A2~ and store PL to accumulator A2.