MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -While Internal RAM is limited to 128 bytes (256 bytes with an 8052), the 8051 supports External RAM up to 64K. Programming Tip: The 8051 may only address 64k of RAM. To expand RAM beyond this limit requires programming and hardware tricks.

Detailed explanation-2: -ram size of 8051 is only 128 bytes ( 00H to 7FH). SFR are located from 80H to FFH. for example address of the ACC is 0E0H and address of the stack pointer is 81H. While there exists 8051 chips that might have 64 or 128 bytes of internal RAM, the majority of 8051 models have 256 bytes of RAM.

Detailed explanation-3: -In an 8051 microcontroller, Internal RAM (data memory)-128 bytes.

Detailed explanation-4: -Explanation: 8051 microcontrollers are manufactured by Intel, Atmel, Philips/Signetics, Infineon, Dallas Semi/Maxim. Explanation: It has 128 bytes of RAM in it.

Detailed explanation-5: -The standard 8051 comes with 4K ROM, 128 bytes RAM, 4 8bit ports and 2 timer counters. Other members of the family are the ROMless 8031, 8052 with 256 bytes of RAM and 3 counter/timers etc.