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List of contents for this article:
- 1、What do DPTR and PC in a MCU represent respectively?
- 2、In the 51 MCU, the PC pointer length is 16 bits, the SP length is 8 bits, and the data pointer DPTR length is 16 bits. This sentence...
- 3、51 What are the respective uses of program pointer PC and data pointer DPTR in MCU? After the circuit is reset, both...
- 4、Ask a master to answer MCU problems.
What do DPTR and PC in a MCU represent respectively?
A DPTR is a data pointer that is used to point to a specific address in the data memory. PC is a program counter that indicates the memory address of the next instruction to be executed. The MOVC A,@A+DPTR instruction adds the address pointed to by the DPTR to the value in the ACC register and loads the data at the resulting address into ACC. This operation is independent of the current value of the PC.
DPTR or PC is the base register, and accumulator A is the index register. This type of addressing method is mainly used for table lookup operations. For example, the operation performed by the instruction MOVC A,@A+DPTR is to add the contents of accumulator A and base register DPTR, the addition result is used as the address where the operand is stored, and then the operand is taken out and sent to accumulator A.
DPTR is a data pointer, PC is program counter instruction MOVC A,@A+DPTR means: add the value of DPTR to the value of ACC, and send the data of the program memory address to which the result points into ACC.
DPTR is mainly used to store a 16-bit address. When addressing a 64kB external data memory, it can be used as an address register. At this time, the following two instructions are used: MOVX A,@DPTR MOVX @DPTR. When A accesses the program memory, DPTR can be used as a base register, and the program memory is accessed using a base + index addressing method. This instruction is often used to read table data in the program memory.
In MCS-51, both PC and DPTR are used to provide addresses. The PC provides addresses for accessing (program) memory, and the DPTR provides addresses for accessing (data, and program) memory. The cell address in the bit addressing area of the MCU is from the (20H) cell to the (2FH) cell. If a bit address is 09H, the address of the cell it is located in should be (21H).
In the 51 MCU, the PC pointer length is 16 bits, the SP length is 8 bits, and the data pointer DPTR length is 16 bits. This sentence...
1. In the 51 MCU, the PC (Program Counter) is a 16-bit register that is used to store the address in the internal program memory (ROM) of the instructions to be executed by the MCU. The 16-bit width allows the MCU to address up to 64KB of program storage space. The SP (Stack Pointer) is an 8-bit register that tracks the top position of the stack. A stack is an area where temporary data is stored and is usually located in the RAM of a microcontroller.
2. After reset, the data pointer is 0000H (16-bit)(DPTR). The data pointer is a 16-bit register. When programming, it can be used as a 16-bit register or as two 8-bit registers. Use, namely the high-order byte register DPH and the low-order byte DPL.
3. Lesson 22:51 The addressing method of single-chip processors to learn assembler program design, you must first understand the various addressing methods of the CPU before you can effectively grasp the purpose of each command... The number is a 16-bit immediate number. Its function is to transfer a 16-bit address to the address pointer DPTR, that is, the upper 8 bits of the immediate number are sent to the DPH and the lower 8 bits are sent to... When executing PUSH and POP instructions, the stack pointer SP is used as register indirect addressing.
4. Wrong. MOV DPTR,#data16 1, Description: This instruction passes a 16-bit constant to the data pointer DPTR. The 16-bit constant is included in bytes 2 and 3 of the instruction. Among them, DPH stores the high byte of #data16, while DPL stores the low byte of #data16. Does not affect the flag. 2. Example: Instruction MOV DPTR,#1234H3, loads the immediate number 1234H into the data pointer register.
5. In the 51 MCU, the SP stack pointer is a dedicated 8-bit register. After the system is reset, the SP is initialized to 07H, so that the stack pointer actually starts from the 08H unit.
6. In the 51 MCU, the pc always points to the first address of the next instruction. The calculation method is: the first address of the currently executed instruction + the byte length occupied by this instruction.
51 What are the respective uses of program pointer PC and data pointer DPTR in MCU? After the circuit is reset, both...
DPTR is mainly used to store a 16-bit address. When addressing a 64kB external data memory, it can be used as an address register. At this time, the following two instructions are used: MOVX A,@DPTR MOVX @DPTR. When A accesses the program memory, DPTR can be used as a base register, and the program memory is accessed using a base + index addressing method. This instruction is often used to read table data in the program memory.
In MCS-51, both PC and DPTR are used to provide addresses. The PC provides addresses for accessing (program) memory, and the DPTR provides addresses for accessing (data, and program) memory. The cell address in the bit addressing area of the MCU is from the (20H) cell to the (2FH) cell. If a bit address is 09H, the address of the cell it is located in should be (21H).
The space that the program pointer points to is physically Flash, but logically, it is code space. For example, the PC pointer of the 51 MCU points to Flash, which is the address of the instruction to be executed next in the program. The data pointer points to a space that physically has Flash and RAM, and logically is the constant space and data space in Flash. Note that for single-chip computers, for our computers, the constant space is not on Flash.
Data pointer register DPTR (composed of connecting the upper 8 bits of DPH and the lower 8 bits of DPL): Used to access external data memory. Program Counter: Points to the current instruction address. It is used internally by the CPU and cannot be accessed through the program. Register Bank: Contains R0, R1,..., R7 has a total of 8 registers and a total of 4 register groups.
In the 51 MCU, the PC (Program Counter) is a 16-bit register that stores the address in the internal program memory (ROM) of the instructions to be executed by the MCU. The 16-bit width allows the MCU to address up to 64KB of program storage space. The SP (Stack Pointer) is an 8-bit register that tracks the top position of the stack. A stack is an area where temporary data is stored and is usually located in the RAM of a microcontroller.
Ask a master to answer MCU problems.
MOV C, bit belongs to the (bit) addressing mode. I don't quite understand the meaning of the question: Both the 16-bit pointer PC and DPTR can access the ROM MCU bit addressing area through index addressing. The unit address in the bit addressing area is from (20H) cell to (2FH) cell. If a certain bit address is 09H, the address of the unit it is located in should be (21H).
Answer: 00H, the LCALL call puts the address 0221H on the stack, first low and then high, so 08H is 00H, and the PC will also change. Here, let's not say that decimal becomes binary, and one bit cannot correspond to four bits. That is the way to change hexadecimal into binary. The mistake is that what others want is binary, but you use binary 16. The 8-bit binary code of 29 is 0001 1101. 8, 4, 2, 1 yard.
In the process of learning the principles and applications of single-chip computers, we often encounter problems with binary conversion. The following question is a typical example: (135) 10=(10000111B) 2=(87H) 16=(0001 0011 0101B) 8421BCD. First, let's analyze this problem, which requires us to convert the decimal number 135 to binary, hexadecimal, and 8421BCD codes.
There are a few problems: You are currently using 138 for line selection, but 138 does not have a latch function, so when the data is refreshed, the data transfer is displayed on the screen. Because the speed is very fast, the eyes are full bright. It is recommended that you also use 595 to control the row selection signal. Driving ability. The driving ability of the 595 is very weak. Given your circuit, I judge that the 595 will easily burn out.
As a baud rate generator, T1 can only work in Mode 2 (i.e., automatic reload mode). The two modes you mentioned are different concepts. One is the timer working mode and the other is the serial port working mode. Of course, SMOD can also be set to 1, and the baud rate will be doubled when it is 1.
Wrong, mov c, 20h is bit addressing. The other is direct addressing. 19 is wrong. It is used to latch the lower eight bits of the p0 port. 20 This is the case in theory, but each MCU must have an upper limit on the clock. 21 to 22 wrong, one instruction cycle can contain several machine cycles 23 pairs of 24 wrong scon is just a control register for serial interrupt. No, SP always points to the top of the stack.
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