Aim: Write an assembly language program to perform two 8 bit numbers addition using immediate, direct, indirect and register addressing modes. Apparatus: A computer loaded with Keil or edsim51. Program: Immediate mode: ORG 0000H LJMP MAIN MAIN: MOV A,#50H ADD A,#30H END Note: Observe 'Acc' for the result. Direct mode: ORG 0000H LJMP MAIN MAIN: MOV 40H,#50H MOV A,#30H ADD A,40H END Note: Observe 'Acc' for the result. Indirect mode: ORG 0000H LJMP MAIN MAIN: MOV 40H,#50H MOV 41H,#30H MOV R0,#40H MOV R1,#41H MOV A,@R0 MOV B,@R1 ADD A,B END Note: Observe 40H, 41H locations, R0, R1 registers and A, B for intermediate results. Observe 'Acc' for the final result. Register mode: ORG 0000H LJMP MAIN MAIN: MOV 40H,#50H MOV 41H,#30H MOV A,40H MOV R0,41H ADD A,R0 END Note: Observe 40H, 41H locations, R0 register and A for intermediate results. Obs
Aim: To study about Keil simulator. Apparatus: A computer loaded with Keil Microvision2 or higher version. Procedure: If we want to develop embedded system program for 8051 using Keil software, we need to follow these steps. 1. Create work directory. 2. Create a new project. 3. Create source files(.alp or .c). 4. Add files to project. 5. Compilation and error checking. 6. Debugging and output verification. 7. Creation of HEX file. 8. Burn the project(HEX file) into ROM of the target device. 1. Create work directory: Go to my computer. Open local disk: D. Create a new folder. Rename with the desired name. That is our work directory. 2.Create a new project: Go to project menu in Keil. Select new project. Click on Atmel. Select AT89C51 or AT89C52 or AT89S51 or AT89S52. Select ok. Next press yes. NOTE: Give the project name and work folder path properly.