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Using multiply-accumulate operation instructions

Posted: 11 Aug 2011     Print Version  Bookmark and Share

Keywords:DSP  function instructions  MCU  arithmetic expressions 

The RX Family CPU core (RX) includes a 16bit × 16bit multiply-accumulate unit. When executing a 32bit × 32bit integer-multiply instruction (MUL instruction), which is normally used for arithmetic expressions or address calculations employing multiplication, the lower 32 bits of the 64bit result of the 32bit × 32bit operation are taken as the calculation result. In other words, it is assumed when using the MUL instruction that the calculation result will not exceed 32 bits.

In this application note, Renesas Electronics discusses how to use the DSP function instructions on RX Family MCUs.

View the PDF document for more information.

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