UAA326A04 HIEE300024R4,UFC718AE101 HIEE300936R0101，UFC718AE01 HI

UAA326A04 HIEE300024R4 ABB  UAA326A041、指令寄存器用来存放正在执行的指令。指令分成两部分：操作码和地址码。操作码用来指示指令的操作性质，如加法、减法等；地址码给出本条指令的操作数地址或形成操作数地址的有关信息（这时通过地址形成电路来形成操作数地址）。

有一种指令称为转移指令，它用来改变指令的正常执行顺序，这种指令的地址码部分给出的是要转去执行的指令的地址。 2、操作码译码器：用来对指令的操作码进行译码，产生相应的控制电平，完成分析指令的功能。 3、时序电路：用来产生时间标志信号。在微型计算机中，时间标志信号一般为三级：指令周期、总线周期和时钟周期。微操作命令产生电路产生完成指令规定操作的各种微操作命令。这些命令产生的主要依据是时间标志和指令的操作性质。该电路实际是各微操作控制信号表达式（如上面的A→L表达式）的电路实现，它是组合逻辑控制器中最为复杂的部分。 4、指令计数器：用来形成下一条要执行的指令的地址。通常，指令是顺序执行的，而指令在存储器中是顺序存放的。所以，一般情况下下一条要执行的指令的地址可通过将现行地址加1形成，微操作命令“1”就用于这个目的。如果执行的是转移指令，则下一条要执行的指令的地址是要转移到的地址。该地址就在本转移指令的地址码字段，将其直接送往指令计数器。 微程序控制器的提出是因为组合逻辑设计存在不便于设计、不灵活、不易修改和扩充等缺点。UAA326A04 HIEE300024R4,UFC718AE101 HIEE300936R0101，UFC718AE01 HIEE300936R0001  Product introduction:

There are instructions called transfer instructions, which are used to change the normal order of execution of instructions. The address section of such instructions gives the address of the instruction to be transferred to execution. 2. Opcode decoder: used to decode the opcode of the instruction, generate the corresponding control level, and complete the function of analyzing the instruction. 3, timing circuit: used to generate time marker signal. In a microcomputer, the time flag signal usually has three levels: instruction cycle, bus cycle and clock cycle. Microoperation command generation The circuit generates various microoperation commands that complete the operation specified by the instruction. These commands are generated primarily based on the time flag and the operational nature of the instruction. The circuit is actually the circuit realization of the expression of each microoperation control signal (as above A→L expression), which is the most complex part of the combinatorial logic controller. 4, Instruction counter: used to form the address of the next instruction to be executed. Normally, instructions are executed sequentially, and instructions are stored sequentially in memory. So, in general, the address of the next instruction to execute can be formed by adding 1 to the current address, and the microoperation command "1" is used for this purpose. If a transfer instruction is executed, the address of the next instruction to be executed is the address to be transferred to. This address is in the address field of this transfer instruction, sending it directly to the instruction counter. Microprogram controller is proposed because combinatorial logic design is not easy to design, not flexible, not easy to modify and expand and other shortcomings.