Lesson 26 Arm 电子技术专业英语教程[冯新宇主编][电子教案].pptVIP

《电子技术专业英语教程》 Unit9 Microcomputer Lesson 26 Arm 《电子技术专业英语教程》冯新宇 主编 电子工业出版社 Lesson 26 Arm Terminology RISC 【计】精简指令集计算机 reduced instruction set computer BBC n.英国广播公司 coprocessor n.【计】协处理器 date back to 从…时就有，回溯到 interrupt latency 中断延迟 MMU 【计】存储器管理单元 The ARM architecture is a 32-bit advanced RISC design. The use of a simple design and a highly orthogonal, yet powerful instruction set allows it to attain good processing speeds at low power consumption. As the demand for greater processing power in embedded devices keeps increasing, so does the popularity of ARM. The architecture is licensed by a large number a microprocessor manufacturers, leading to a wide choice and availability of ARM based CPUs and microcontrollers. Current ARM based CPUs are powerful enough to allow a large variety of DSP processing tasks to be performed without the use of a coprocessor. ARMv1, ARMv2 and ARMv2a Introduced in 1985, the ARM1 was the first incarnation of the ARMv1 architecture, a 32 bits architecture, using 26 bits addressing. The ARMv2 and ARM2 added multiplication and multiply-accumulate capability, as well as coprocessor support. The ARM3 (using ARMv2a) added a 4k on-chip code and data cache. ARMv3 – ARM6 and ARM7 ARMv3 moved the ARM architecture toward full 32 bits addressing, and also allowed for chips to optionally contain a Memory Management Unit (MMU), allowing the chip to run full operating systems. ARMv3M added optional long multiplication support (32 × 32 = 64 bits), marked by an M in the processor type name. ARMv4 — ARM7TDMI-S and Thumb The ARMv4 is a further evolution of the ARMv3 design, adding support for 16 bits load and stores, and dropped support for 26-bit addressing. It was introduced in 1995. A major step forwards in the ARM architecture was made by the introduction of Thumb in ARMv4T. Thumb is a new instruction set for the ARM architecture, using 16 bits instructions. It represents a significant enhancement to the ARM architectu