Single chip introduction tutorial ninth lesson - MCU directive (2)
Data transfer class instruction (3) Instruction MOV Direct, A case: MOV 20H, A MOV Direct, R1MOV Direct1, Direct2 Mov 20h, 30HMOV Direct, @ ri Mov 20h, @ r1mov Direct, # data mov 20h, # 34h (4) Instruction Mov @ ri, A case: Mov @ r0, a mov @ ri, direct mov @ r1, footlight @ ri, # data mov @ r1, foot R0, # 34h (5) Tempse Directive MOV DPTR, # data16 8051 is an 8-bit machine, this is the only 16-bit immediate number of conveyance instructions, its function is to send a 16-bit immediate number Enter 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. Integrated practice: gives the results after each instruction execution.
Mov 23h, # 30hmov12h, # 34hmov R0, # 23HMOV R7, # 22HMOV R1, 12HMOV A, @ r0mov 34h, @ r1
(23h) = 30 h (12h) = 34 h (r0) = 23h (R7) = 22h (R1) = 12h (a) = 30 h (34h) = 34h
MOV 45H, 34HMOVDPTR, # 6712HMOV 12H, DPHMOV R0, DPLMOV 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. Practical practice: Enter the DOS state, enter the directory where WAVE is located, type MCS51, appear as follows Figure 1, press File->Open, the dialog box, enter a file name at Name (see Figure 2) If it is existing in the list below, open this file. If this file does not exist, create a file (see Figure 3)
Figure 2 is input to 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 Changes in memory in memory can be seen here, and can be observed with the following method (see Figure 5): Move the mouse to the DATA, double-click, then the cursor enters this line, at which time the upper and down the upper and down the upper and lower cursor keys on the keyboard Turn to observe 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 process, enter its anti-assembly 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. This time, please use the software, tell the truth, I don't like it very much, it is not convenient to operate, but I can only put this, there is no way, I will introduce a good one for the next time. Bar. , Reading the full text, the technology area
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