Table of Contents
What is the size of stack in 8051?
The stack pointer in the 8051 is 8-bits wide, and it can take a value of 00 to FFH. When the 8051 is initialized, the SP register contains the value 07H.
What is the maximum addressing capability of 8051 micro controller?
Up to 64 k-bytes of additional data memory can be addressed by the 8051. The external data memory is accessed using the “MOVX” instruction.
What is the address range of 8051?
00H to 1FH
Internal RAM of 8051 Microcontroller The address range is 00H to 1FH. These 32-bytes of spaces are again divided into four register banks. The second part is 16-bytes of bit addressable registers. It ranges from 20H to 2FH.
What is the maximum value of stack pointer?
A stack in the main memory is implemented from memory location (0100)hex and it grows upward. The stack pointer (SP) points to the top element of the stack. The current value of SP is (016E)hex.
What are the address range of SFR in 8051?
Classic 8051 devices support the SFR address range 0x80-0xFF.
What is the use of stack in 8051 microcontroller?
Stack Memory Allocation in 8051 Microcontroller. The stack is an area of random access memory (RAM) allocated to hold temporarily all the parameters of the variables. The stack is also responsible for reminding the order in which a function is called so that it can be returned correctly.
How many address lines are there in 8051?
When this line is „1‟, the 16 address lines are being used to address the data memory. 22. Contd. The 8051 has 256 bytes of internal addressable RAM, although only first 128 bytes are available for general use by the programmer.
What is size of ROM in 8051 microcontroller?
8051 microcontroller is designed by Intel in 1981. It is an 8-bit microcontroller. It is built with 40 pins DIP (dual inline package), 4kb of ROM storage and 128 bytes of RAM storage, 2 16-bit timers.
How many address memory locations are available in 8051?
As we know the 8-bit address can locate 256 different locations, but here only 128-bits are addressable. Another section of bit addressable locations is 80H to FFH. The remaining locations (30H to 7EH) of the RAM can be used to store variable data and stack.
What is the address of stack pointer?
The Stack Pointer register will hold the address of the top location of the stack. And the program counter is a register always it will hold the address of the memory location from where the next instruction for execution will have to be fetched.
What is stack limit?
Stacking limit by number. Function/description : To indicate that the items shall not be vertically stacked beyond the specified number, either because of the nature of the transport packaging or because of the nature of the items themselves.
What is the size of address bus and data bus of 8051?
The 8051 is an 8-bit microcontroller with 8 bit data bus and 16-bit address bus. The 16 bit address bus can address a 64K( 216) byte code memory space and a separate 64K byte of data memory space.