Digital Electronics - The 8051 Microcontroller - Discussion

Yes, the 8051 microcontroller has 128 bytes of RAM.

FURTHER, they're divided into three parts.

1. Register bank (32 bytes).
2. Bit addressable memory (16 bytes).
3.Read/ write storage/scratchpad (80 bytes).

The answer is 256.

Internal memory of 8051 is 128 bytes.

The internal RAM memory of the standard 8051 microcontroller is 128 bytes. This internal RAM is used for data storage during program execution and is directly accessible by the CPU.

Details about the 8051 internal RAM:
It consists of 128 bytes of on-chip RAM at addresses 00H to 7FH.
The memory is divided into areas such as register banks, bit-addressable memory, and general-purpose RAM.
This RAM is volatile, used for temporary storage, and loses data when power is off.
The 8051 architecture also supports external RAM accessed via special instructions for larger data needs.

In 8051 Memory,

ROM (Program memory) - 4K (Internal memory) + 60K (External memory).

RAM (Data memory) - 128 bytes (Internal memory) + 64K (External memory).

128 bytes of user RAM and 128 bytes SFR`s.

Yes, I agree with you all. The right answer is 128 bits.

Actually RAM is 256 bytes but for user it is 28 bytes and for SFR (Special Function Registers) it is 128 bytes.

Because 2^7 (i.e. 2 power 7) = 128 bytes.

128 bytes for user RAM.

And 128 bytes for SFR's.