8051 Microcontroller and Embedded Systems, The by Muhammad Ali Mazidi

By Muhammad Ali Mazidi

This ebook 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 elucidate options. 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 complete figuring out of the interior association of the 8051 registers and assets in a manner that sheds the scholars worry of meeting language. even if scholars turn into designers of stand-alone platforms or complicated embedded structures, they are going to locate this article an invaluable source.

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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 ƒ ƒ 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 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 ƒ 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 ƒ 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 32 INSIDE THE COMPUTER Internal Working of Computers (cont’) Ex. (cont’) Action Code Data Move value 21H into reg. A Add value 42H to reg. A Add value 12H to reg. A B0H 04H 04H 21H 42H 12H Mem. addr. 1400 1401 1402 1403 1404 1405 1406 Contents of memory address (B0) code for moving a value to register A (21) value to be moved (04) code for adding a value to register A (42) value to be added (04) code for adding a value to register A (12) value to be added (F4) code for halt ...

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