ARM7TDMI データシートの表示（PDF） - Unspecified

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ARM7TDMI

General-Purpose 32-Bit Microprocessors

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Introduction

Thumb therefore offers a long branch range, powerful arithmetic operations, and a large

address space.

Thumb code is typically 65% of the size of ARM code, and provides 160% of the

performance of ARM code when running from a 16-bit memory system. Thumb,

therefore, makes the ARM7TDMI core ideally suited to embedded applications with

restricted memory bandwidth, where code density and footprint is important.

The availability of both 16-bit Thumb and 32-bit ARM instruction sets gives designers

the flexibility to emphasize performance or code size on a subroutine level, according

to the requirements of their applications. For example, critical loops for applications

such as fast interrupts and DSP algorithms can be coded using the full ARM instruction

set then linked with Thumb code.

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