By Muhammad Ali Mazidi
This booklet makes use of a step by step method of train the basics of meeting language programming and interfacing of the 8051 microcontroller. It makes use of many examples to explain thoughts. easy, concise examples are applied to teach what motion every one guideline plays, then a pattern is supplied to teach its software. this article presents a finished realizing of the inner association of the 8051 registers and assets in a manner that sheds the scholars worry of meeting language. no matter if scholars develop into designers of stand-alone platforms or complicated embedded structures, they're going to locate this article an invaluable source.
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HANEL Department of Computer Science and Information Engineering National Cheng Kung University, TAIWAN 33 Ex. (cont’) The actions performed by CPU are as follows: 1. The program counter is set to the value 1400H, indicating the address of the first instruction code to be executed INSIDE THE COMPUTER Internal Working of Computers 2. ¾ (cont’) The CPU puts 1400H on address bus and sends it out ¾ 以動畫表示 The memory circuitry finds the location The CPU activates the READ signal, indicating to memory that it wants the byte at location 1400H This causes the contents of memory location 1400H, which is B0, to be put on the data bus and brought into the CPU ...
HANEL Department of Computer Science and Information Engineering National Cheng Kung University, TAIWAN 35 INSIDE THE COMPUTER Ex. (cont’) 4. ¾ ¾ Internal Working of Computers ¾ (cont’) From memory location 1402H it fetches code 04H After decoding, the CPU knows that it must add to the contents of register A the byte sitting at the next address (1403) After the CPU brings the value (42H), it provides the contents of register A along with this value to the ALU to perform the addition It then takes the result of the addition from the ALU’s output and puts it in register A The program counter becomes 1404, the address of the next instruction ...
HANEL Department of Computer Science and Information Engineering National Cheng Kung University, TAIWAN 34 INSIDE THE COMPUTER Ex. (cont’) 3. ¾ ¾ Internal Working of Computers The CPU decodes the instruction B0 The CPU commands its controller circuitry to bring into register A of the CPU the byte in the next memory location (cont’) ¾ The value 21H goes into register A The program counter points to the address of the next instruction to be executed, which is 1402H Address 1402 is sent out on the address bus to fetch the next instruction ...