Page 69 - CITS - Electronic Mechanic - TT - 2024

ELECTRONICS MECHANIC - CITS

In the 8051 microcontrollers, the stack is 8-bit wide, and it can hold data from 00 – FFH. The stack pointer can
be used through the CPU to allow the stack. This microcontroller includes an 8-bit stack pointer that means it can
allow values from 00H to FFH. Once it is activated, then the stack pointer includes the 07 value.

Organization of Memory

The microcontroller has complex memory organization, and it includes a separate address bus that is used for
program memory, external RAM & data memory. It depends on Harvard architecture that is developed through
Harvard in the year 1944.

Addressing Modes
Microprocessors get data in different methods. Generally, the data stored within memory, register & can be used
from instant value. So, these different methods for accessing data are known as addressing modes. Different
types of microcontrollers include different addressing modes which depend on the plan of manufacturers. The
addressing modes of this microcontroller includes the following.
Register

Register indirect
Immediate
Indexed
Direct

Pin Diagram Of Microcontroller 8051

The pin diagram of 8051 microcontroller looks as follows:

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CITS : E & H - Electronics Mechanic - Lesson 34 - 42