Web5. 5 of 37 Thumb Instruction Set • ARM architecture versions v4T and above define a 16-bit instruction set called the Thumb instruction set. The functionality of the Thumb instruction set is a subset of the functionality of the 32-bit ARM instruction set. • A processor that is executing Thumb instructions is operating in Thumb state. http://www.paulkilloran.com/arm/Lecture_7.pdf
The ARM processor (Thumb-2), part 1: Introduction
WebAlmost the entire original ARM instruction set functionality can be achieved with Thumb2. Since the instruction stream is more dense, it is higher performance than the original ARM in almost every case due to lower instruction fetch overhead. Thumb2 allows conditional execution for four instructions with 'if/else' opcode conditions. WebARM and Thumb instructions can be grouped by functional area. All ARM instructions are 32 bits long. Instructions are stored word-aligned, so the least significant two bits of instruction addresses are always zero in ARM state. Thumb instructions are either 16 or 32 bits long. Instructions are stored half-word aligned. directions to greenbrier mall
Introduction to the ARM* Processor Using ARM Toolchain
The Thumb instruction set consists of 16-bit instructions that act as a compact shorthand for a subset of the 32-bit instructions of the standard ARM. Every Thumb instruction could instead be executed via the equivalent 32-bit ARM instruction. However, not all ARM instructions are available in the Thumb … See more Many of today’s most popular 32-bit microcontrollers use RISC technology. Unlike CISC processors, RISC engines generally execute each instruction in a single clock cycle, … See more When operating in the 16-bit Thumb state, the application encounters a slightly different set of registers. Figure 1 compares the … See more The biggest reason to look for an ARM processor with the Thumb instruction set is if you need to reduce code density. In addition to reducing the total amount of memory required, you may also be able to narrow the data bus … See more There are several ways to enter or leave the Thumb state properly. The usual method is via the Branch and Exchange (BX ) instruction. See … See more WebTHUMB Instruction Set This section gives an overview of the THUMB instructions available. For full details of these instructions, please refer to the ARM Architecture Reference Manual (ARM DDI 0100). Format summary The THUMB instruction set formats are shown in the following figure. Figure 1.3. THUMB instruction set formats Web35. 35 of 37 Properties • Thumb code requires 70% of space of ARM code • Thumb code uses 40% more instructions than the ARM code • With 32-bit memory ARM code is 40% faster • With 16-bit memory Thumb code is 45% faster than ARM code • Thumb code uses 30% less external memory power than ARM code. directions to green bay wisconsin