Which memory is a scratch pad?
2 Scratchpad memory. Scratchpad memory (SPRAM) is a high-speed internal memory directly connected to the CPU core and used for temporary storage to hold very small items of data for rapid retrieval.
What is the size of scratch pad memory?
The scratch-pad is implemented as two 128 bytes chips, one holding the odd bytes, the other one holding the even bytes. Together, they make up a 16-bit data bus which results in quicker memory access. Apart for the console ROMs, this is the only 16-bit memory in the TI-99/4A system.
What is the starting memory location of scratch pad in internal RAM?
The internal data memory of 8051 is divided into two groups. These are a set of eight registers, and a scratch pad memory. These eight registers are R0 to R7. The address range 00H to 07H is used to access the registers, and the rest are scratch pad memory.
What is scratch pad register?
A scratchpad register is. a plurality of multibit storage locations, usually located in the central processing unit (CPU) of a computer, used for temporary storage of program information, operands, and calculation results for use by the computer’s arithmetic and logic unit, and other information of a temporary nature.
What is the use of scratch pad area of internal RAM of 8051?
RAM Memory Space Allocation in 8051 80 bytes from 30H to 7FH locations are used for read and write storage; it is called as scratch pad. These 80 locations RAM are widely used for the purpose of storing data and parameters by 8051 programmers.
What do you know about cache memory?
cache memory, also called cache, supplementary memory system that temporarily stores frequently used instructions and data for quicker processing by the central processing unit (CPU) of a computer. Cache holds a copy of only the most frequently used information or program codes stored in the main memory.
What is the high speed memory between main memory and CPU?
Explanation: It is called the Cache Memory. The cache memory is the high speed memory between the main memory and the CPU.
What is the use of accumulator register?
All microprocessors make use of an accumulator register that can supply one number for an action, and where the result of an action will also be stored. The size of the accumulator in terms of bits is used as a measure of the data unit capability of the microprocessor (as 8-bit, 16-bit, 32-bit, 64-bit, and so on).
What is size of scratchpad RAM for 8051?
But almost all modern variants of 8051 Microcontroller have 256B of RAM. In this 256B, the first 128B i.e., memory addresses from 00H to 7FH is divided in to Working Registers (organized as Register Banks), Bit – Addressable Area and General Purpose RAM (also known as Scratchpad area).
Which pins of Port 3 can be used for interfacing an external memory with 8051?
Pins 10 to 17 − These pins are known as Port 3. This port serves some functions like interrupts, timer input, control signals, serial communication signals RxD and TxD, etc. Pins 18 & 19 − These pins are used for interfacing an external crystal to get the system clock.
