Built-In Multiply-Accumulate Operation Function; Built-In Flash Memory And Ram - Mitsubishi Electric M32R Series User Manual

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1.1.2 Built-in Multiply-Accumulate Operation Function

(1) Built-in high-speed multiplier
• The M32R incorporates a 32-bit × 16-bit high-speed multiplier which enables it to execute a
32-bit × 32-bit integral multiplication instruction in three cycles (1 cycle = 25 ns when using a 40
MHz internal CPU clock).
(2) Supports Multiply-Accumulate operation instructions comparable to DSP
• The M32R supports the following four modes of Multiply-Accumulate operation instructions (or
multiplication instructions) using a 56-bit accumulator. Any of these operations can be
executed in one cycle.
16 high-order register bits × 16 high-order register bits
16 low-order register bits × 16 low-order register bits
Entire 32 register bits × 16 high-order register bits
Entire 32 register bits × 16 low-order register bits
• The M32R has instructions to round off the value stored in the accumulator to 16 or 32 bits, as
well as instructions to shift the accumulator value to adjust digits and store the digit-adjusted
value in a register. These instructions also can be executed in one cycle, so that when
combined with high-speed data transfer instructions such as Load & Address Update and
Store & Address Update, they enable the M32R to exhibit high data processing capability
comparable to that of DSP.

1.1.3 Built-in Flash Memory and RAM

• The 32170 contains flash memory and RAM which can be accessed with no wait states,
allowing you to build a high-speed embedded system.
• The internal flash memory allows for on-board programming (you can write to it while being
mounted on the printed circuit board). Use of flash memory means the chip engineered at the
development phase can be used directly in mass-production, so that you can smoothly
migrate from prototype to mass-production without changing the printed circuit board.
• The internal flash memory can be rewritten 100 times.
• The internal flash memory has a pseudo-flash emulation function, allowing the internal RAM to
be artificially mapped into part of the internal flash memory. This function, when combined with
the internal Real-Time Debugger (RTD), facilitates data tuning on ROM tables.
• The internal RAM can be accessed for read or rewrite from an external device independently
of the M32R by using RTD (real-time debugger). It is communicated with external devices by
RTD's exclusive clock-synchronized serial I/O.
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OVERVIEW
1.1 Outline of the 32170
Ver.0.10