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RL78/G1A CHAPTER 14 MULTIPLIER AND DIVIDER/MULTIPLY-ACCUMULATOR
The register configuration differs between when multiplication is executed and when division is executed, as follows.
• Register configuration during multiplication
<Multiplier A> <Multiplier B> <Product>
MDAL (bits 15 to 0) × MDAH (bits 15 to 0) = [MDBH (bits 15 to 0), MDBL (bits 15 to 0)]
• Register configuration during multiply-accumulation
<Multiplier A> <Multiplier B> < accumulated value > < accumulated result >
MDAL (bits 15 to 0) × MDAH (bits 15 to 0) + MDC (bits 31 to 0) = [MDCH (bits 15 to 0), MDCL (bits 15 to 0)]
(The multiplication result is stored in the MDBH (bits 15 to 0) and MDBL (bits 15 to 0).)
• Register configuration during division
<Dividend> <Divisor>
[MDAH (bits 15 to 0), MDAL (bits 15 to 0)] ÷ [MDBH (bits 15 to 0), MDBL (bits 15 to 0)] =
<Quotient> <Remainder>
[MDAH (bits 15 to 0), MDAL (bits 15 to 0)] ⋅⋅⋅ [MDCH (bits 15 to 0), MDCL (bits 15 to 0)]
R01UH0305EJ0200 Rev.2.00 657
Jul 04, 2013