Single-chip data transfer class instruction
(3) instructions for operands as dedicated to the direct address
MOV Direct, A case: MOV 20H, A
MOV Direct, RN MoV 20H, R1
MOV Direct1, Direct2 MOV 20H, 30H
Mov Direct, @ ri mov 20h, @ r1
Mov Direct, # Data MoV 20h, # 34h
(4) Instructions for operands with indirect address
Mov @ ri, A case: MOV @ r0, A
Mov @ ri, Direct Mov @ r1, 20h
Mov @ ri, # data mov @ r0, # 34h
(5) Passing Directive
Mov dptr, # data16
8051 is an 8-bit machine, this is the only 16-bit immediate digital delivery directive, which feature a 16-bit immediate number to DPTR. Among them, 8 digits are sent to DPH, and the low 8 bits are sent to DPL. Example: MOV DPTR, # 1234h, then the value in the DPH is 12 h after execution, the value in the DPL is 34h. Conversely, if we send numbers to DPH, DPL, the results are the same. If there are two instructions below: MOV DPH, # 35H, MOV DPL, # 12h. Then it is equivalent to executing MOV DPTR, # 3512h.
Data transfer class instruction integrated exercise:
Give the result after each instruction execution
Practice:
Mov 23h, # 30h
Mov 12h, # 34h
MOV R0, # 23h
Mov r7, # 22h
MOV R1, 12H
Mov A, @ r0
MOV 34H, @ r1
(23h) = 30h
(12h) = 34h
(R0) = 23h
(R7) = 22h
(R1) = 12h
(A) = 30h
(34h) = 34h
MOV 45H, 34H
Mov dptr, # 6712h
MOV 12H, DPH
MOV R0, DPL
Mov A, @ r0
(45H) = 34h
(Dptr) = 6712h
(12h) = 67h
(R0) = 12h
(A) = 67h
Note: The contents of the inner RAM23H unit are represented by parentheses, such as (a) representing the value in the accumulator A unit.
Enter the DOS state, enter the directory where WAVE is located, Example D: \ Wave
Type MCS51, appear as follows
< Single chip data transfer instructions. 1882. Figure 1
Press File->Open, after the dialog box, enter a file name (see Figure 2) at the NAME, if it is existing in the list below, open this file, if this file does not exist, create a new file (See Figure 3)
figure 2
Enter the above program in the blank. See Figure 4. Use Alt + A to adopt. Use f8 to perform a single step, pay attention to the change in the working register and the value in the A accumulator in the A accumulator during the execution.
Figure 4
The change in memory is not seen here, and it can be observed with the following method (see Figure 5): Move the mouse to DATA, double-click, then the cursor enters this line, at which time the upper and down the upper and down the upper and down, the upper and lower scales can be turned up and down. Observe the changes in memory. The data represented by the Bank's top DATA is "a paragraph" start address, such as 20h, then look at the top of the screen, the number is added from 0 to F, the display is added equal to the real address value, such as The values in the memory 20h, 21h, 22h, 23h shown on the figure are FBH, 0EH, E8H, 30H, respectively.
Figure 5
6. After running the program, enter its disassembly area, not what we want. In order to start from the beginning, the PC value can be reset with the CTRL + F2 function key. Be careful not to see the original window, to see the original window, use ALT + 4 or ALT + 5, etc. to switch. Of course, the above operations can also be done. Ctrl + F2 is a program reset, with a Run menu. The window is used with the Windows menu.
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