处理器技术 ·“处理器”不是一定都是可编程的 一嵌入式微处理器并不等同于通用微处理器 Controller Datapath Controller Datapath Controller Datapath Control Register Control Registers Control index logic and logic and logic file total State State Custom State register register + ALU register General IR PC ALU R PC Data Data memory memory Program Data Program memory memory memory Assembly code Assembly code for: for: total=0 total =0 for i=1 to .. for i=1 to... General-purpose ("software") Application-specific Single-purpose("hardware") llxx@ustc.edu.cn 10/87处理器技术 • “处理器”不是一定都是可编程的 – 嵌入式微处理器并不等同于通用微处理器 Registers Custom Controller Datapath Control logic and State Controller Datapath Control logic State index total Register file Controller Datapath Control logic and State llxx@ustc.edu.cn 10/87 Application-specific Custom ALU Program memory Assembly code for: total = 0 for i =1 to … State register Data memory IR PC Single-purpose (“hardware”) State register Data memory + IR PC General ALU Program memory Assembly code for: total = 0 for i =1 to … State register Data memory General-purpose (“software”)