8051 Microcontroller Architecture

8051 Microcontroller Block Diagram

8051 Architecture

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8051 Architecture

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8051 Architecture

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8051 PIN DIAGRAM

8051 Memory Organization

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8051 Microcontroller Architecture

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8051 Microcontroller Architecture

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8051 Microcontroller Block Diagram

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8051 Architecture

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8051 has 4 K Bytes of internal ROM. The address space is from 0000 to 0FFFh.

Features

8051 Architecture

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It is an 8 bit register widely used for all arithmetic and logical operations. Accumulator is also used to transfer data between external memory.

Accumulator

8051 Architecture

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This is an 8 bit register which contains the arithmetic status of ALU and the bank select bits of register banks.

PSW (Program Status Word)

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it contains the address of the data item on the top of the stack. Stack may reside anywhere on the internal RAM. On reset, SP is initialized to 07 so that the default stack will start from address 08 onwards.

Stack Pointer (SP)

8051 Architecture

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Data Pointer (DPTR) – DPH (Data pointer higher byte), DPL (Data pointer lower byte). This is a 16 bit register which is used to furnish address information for internal and external program memory and for external data memory.

Data Pointer (DPTR)

8051 Architecture

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Program Counter (PC) – 16 bit PC contains the address of next instruction to be executed. On reset PC will set to 0000. After fetching every instruction PC will increment by one.

Program Counter (PC)

8051 Architecture

8051 PIN DIAGRAM

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8051 Memory Organization

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8051 Memory organization consists of Internal RAM, registers, Bit addressable RAM, General purposr RAM and Stack.

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