The 8051 Microcontroller and Embedded

Department of Computer Scien

ce and Information Engineering

National Cheng Kung University, TAIWAN

HANEL

INSIDE THE COMPUTERInternal Working of Computers(cont’)

Ex. (cont’)3.
¾
The CPU decodes the instruction B0
¾
The CPU commands its contro

ller circuitry to bring

into register A of the CP

U the byte in the next

memory locationƒ

The value 21H goes into register A

¾

The program counter points to the address of the next instruction to be executed, which is 1402Hƒ

Address 1402 is sent out on the address bus to fetch the next instruction

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