A designer is developing an 8051-based embedded system that requires storage of a large amount of frequently changing data exceeding the internal RAM capacity, while keeping the program code unchanged. Which memory configuration is most suitable?
Code in ROM, data in external RAM
The 8051 follows the Harvard architecture with separate program (code) memory and data memory. It has only 128 bytes of internal RAM (256 bytes in the 8052) but can address up to 64 KB of external data RAM through the DPTR and MOVX instructions.
The program code does not change, so it is best kept in non-volatile ROM/Flash (internal or external code memory), which retains it without power.
The data is large and changes often, so it needs writable memory larger than the internal RAM — external RAM is the natural choice.
The other configurations fail: keeping data in internal RAM does not meet the capacity requirement; ROM cannot store frequently changing data because it is not written at run time; and placing code in RAM makes it volatile and wastes the data space needed.
Hence, the answer is Code in ROM, data in external RAM.
Similar Questions
Which addressing mode in the 8051 microcontroller allows data to be accessed through an address stored in a register (such as R0, R1, or DPTR)?
Which statement best describes the function of the MOV instruction in the 8051 microcontroller?
Important Questions from Microprocessors and Microcontrollers
Data and address bus width of 8085 microprocessor respectively are
How many bits are used in the data bus of 8051 ?
- Which of the 8051 ports need pull-up resistors to function as an I/O port?
How many bytes are used by the given data directive of the 8051 microcontroller?
DATA_1 DB "INDIA"
A. Microcontrollers are normally less expensive than microprocessors.
B. The 8051 microcontroller has three on-chip timers.
C. Mode 2 of 8051 timer is used to set the baud rate.
D. For the LCD to recognize information at the data pins as data, the register select (RS) pin must be set to low.
E. A driver must be placed between the micrcontroller and the stepper motor.
Choose the correct answer from the options given below:
