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51 What are the respective uses of program pointer PC and data pointer DPTR in MCU? After the circuit is reset, both...

1. DPTR is mainly used to store 16-bit addressesWhat are MCU PC instructions, when addressing 64kB external data memoryWhat are MCU PC instructions, can be used as an address register. In this case, the following two instructions are usedWhat are MCU PC instructions: MOVX A,@DPTR MOVX @DPTR, A When accessing program memory, DPTR can be used as a base register, and the program memory is accessed using base + index addressing method. This instruction is often used to read table data in program memory.

2. In MCS-51, both PC and DPTR are used to provide addresses. PC provides addresses for accessing (program) memory, and 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).

3. The space that the program pointer points to is physically Flash, but logically, it is the 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.

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