Program to Read from external memory 8051 Expriments by Ravinder Nath Rajotiya - June 3, 2021May 9, 20220 Objectives: To learn interfacing of external memory with 8051 To understand the instructions for accessing the memory To develop a program to read and write data to external memory Theory: 8051 Microcontroller on the other hand has onchip 4KB of ROM and 128B of RAM. 8052 has 8KB of program memory (ROM) and 256 bytes of data memory (RAM). For simple to less complex applications this is sufficent, but, If the program and data tend to be larger and require more memory than available on 8051/8052 then external RAM and ROM can be interfaced with 8051 microcontroller. Thus, there is a provision of connecting both external RAM and ROM i.e., Data Memory and Program. Interfacing memory with 8051 We can interface a maximum of
8051 Experiment-1: Introduction to KIT ET-8031/51 8051 Expriments by Ravinder Nath Rajotiya - October 10, 2020May 27, 20210 Introduction to Hardware ET-8031/51 KIT: General: 8-bit 8031/8051 microcontroller operating at 10/12 MHz with on-chip oscillator and clock circuit, 8 i/o lines, two 16-bit timers/counters, five sources of interrupt structure. 64 KB of external program memory and 64 KB of data memory. Memory: Kit has 8KB RAM using IC 6264 and 32KB of EEPROM monitor using IC 27256 There is a memory space provided for memory expansion, the space can be defined for an address from 4000 – FFFF depending upon size of memory chip to be used. I/O Devices: The kit uses 8279 programmable KB-display controller, 8253- programmable interval timer, 8255 –programmable peripheral interface, peripheral chips. These are explained below: 8279 –Programmable KB and display controller:It is a general
8051 Internal Architecture 8051 Micro-controller by Ravinder Nath Rajotiya - April 19, 2019May 8, 20220 8051 Internal Architecture 8051 microcontroller was developed by Intel in 1980s. It is an 8-bit controller and is based on Harvard Architecture which uses two separate memory for storing program and data. The internal architecture describes the organization of the internal components of 8051. Figure 5.1 shows the internal architecture of 8051. Internal components of 8051 Internal Memory: 8051 has two separate memory blocks these are program memory (ROM) and data memory (RAM). Data Memory RAM is used as data memory. 8051 has 256 byte of direct addressable memory and 128 byte indirect addressable memory. 256 Byte RAM includes four register banks named bank 3 through bank 0. Each bank contains 8-register each of 8-bits. they are name R7 through R0. It also include 16