Easily decide the main points of what needs to be bought, recognize probable suppliers, solicit bids or proposals, negotiate contracts, and efficiently deal with the delivery of products and companies. 对于有移位操作的非法指令，C为移位操作中最后移出位的值。 七种运行模式：usr（用户）、fiq（快速中断）、irq（外部中断）、svc（管理）、sys（系统）、abt（数据访问中止）、und（未定义指令中止）... https://kylerkkewn.blognody.com/35280965/the-smart-trick-of-cpsr-that-nobody-is-discussing