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  ARM is short for Advanced RISC Machine , which is a 32-bit lean instruction set architecture, but is also equipped with a 16-bit instruction set, generally saving up to 35% over the equivalent 32-bit code, while retaining all the advantages of a 32-bit system.   The main features of ARM processors are.   (1) Small size, low power consumption, low cost, high performance - the most important reason why ARM is widely used in embedded systems Support for Thumb (16-bit)/ARM (32-bit) dual instruction set, which is well compatible with 8-bit/16-bit devices.   (2) Extensive use of registers for faster instruction execution.   (3) Most data operations are done in registers.   (4) Flexible and simple addressing methods and high execution efficiency.   (5) Instruction length is fixed.   (6) Load_store structure: In RISC, all calculations are required to be done in the registers. And the communication between registers and memory is done by separate instructions. And in CSIC, the CPU is able to