What are the different areas of the 8051 microcontroller's internal data memory?-EEWORLD

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Answer: The 128B data RAM area inside the 8051 includes the working register group area, the directly addressable area and the data buffer area. The characteristics of each area are as follows:

(1) 00H~1FH is the working register group area, which is divided into 4 groups. Each group occupies 8 RAM byte units. Each unit is used as a working register. The 8 units in each group are defined as 8 working registers R0~R7. The selection of the current working register group is determined by the RS1 and RS0 bits of the program status word PSW. If the working registers are not needed or the 4 working registers are not needed in the actual application, the area of the unused working register group can still be used as a general data buffer, which can be accessed by direct addressing or indirect addressing of the register Ri.

(2) 20H~2FH is the bit-addressable area. Each bit of these 16 bytes has an address, which is 00H~7FH.

Of course, the bit-addressable area can also be used as a general data buffer for byte addressing.

(3) 30H~7FH are the stack and data buffer.

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