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Individual Instruction Descriptions
4-138
4.14.43 MULSPL Multiply and Subtract PL From Accumulator
Syntax
[label] name dest, src [, mod] Clock, clk Word, w With RPT, clk Class
MULSPL An, {adrs} Table 4–46 Table 4–46 1b
MULSPL An[~], 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 An, {adrs}
0 1 1 1 1 1 1 An adrs
x dma16 (for direct) or offset16 (long relative) [see section 4.13]
MULSPL An[~], An[~], [next A] 1 1 1 0 0 next A 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 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 An
MULSPL An[~], An[~] [, next A] Multiply MR by An[~] word, substract PL to An[~]
See Also MULSPLS, MULTPL, MULTPLS, MULAPL, MULAPLS
Example 4.14.43.1 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 4.14.43.2 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.