3. Write programs by 8051 microcontroller that will accomplish the desired tasks listed below, using as few lines of code as possible.

Use only opcodes that have been covered in class. Comment on each line of code.

1. Place the number 3Bh in internal RAM locations 30h to 32h

2. copy the data at internal RAM location F1h to R0 and R3

3. Set the SP at the byte address just above the last working register address

4. Exchange the contents of the SP and the PSW

5. Copy the byte at internal RAM address 27h to external RAM address 27h

6. Copy the content of DPTR to registers R0(DPL) and R1(DPH)

7. Copy the data in external RAM location 0123h to TL0 and the data in external RAM location

01234h to TH08. Copy the data in internal RAM locations 12h to 15h to internal RAM locations 20h to 23h ; copy

12h to 20h, 13h to 21h, etc. . .

9. Set the SP register to 07h and PUSH the SP register on the stack ; predict what number is PUSHED

to address 08h

10. Exchange the content of the B register and external RAM address 02CFh

11. Rotate the bytes in registers R0 to R3 ; copy the data in R0 to R1, R1 to R2, R2 to R3 and R3 to

R0

12. Copy the external code byte at address 007Dh to the SP

13. Copy the data in register R5 to external RAM address 032Fh

14. Copy the internal code byte at address 0300h to external RAM address 0300h

15. Swap the bytes in TIMER 0 ; put TL0 in TH0 and TH0 in TL0

16. Store DPTR in external RAM locations 0123h (DPL) and 02BCh (DPH)

17. Exchange both low nibbles of registers R0 and R1 ; put the low nibble of R0 in R1, and the low

nibble of R1 in R0

18. Store the content of register R3 at the internal RAM address contained in R2. (Be sure the address

in R2 is legal)

19. Store the content of RAM location 20h at the address contained in RAM location 08h

20. Store register A at the internal RAM location address in register A

21. Copy program bytes 0100h to 0102h to internal RAM locations 20h to 22h

22. Copy the data on the pins of port p2 to the port 2 latch

23. PUSH the contents of the B register to TMOD

24. Copy the contents of external code memory address 0040h to IE

25. Show a set of XCH instructions executes faster than PUSH and POP when saving the contents of

the A register.