AT89S52-24PC datasheet(8/30 Pages) ATMEL

Part #	AT89S52-24PC

Description	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

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Manufacturer	ATMEL [ATMEL Corporation]

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AT89S52

8

Memory Organization

MCS-51 devices have a separate address space for Pro-

gram and Data Memory. Up to 64K bytes each of external

Program and Data Memory can be addressed.

Program Memory

If the EA pin is connected to GND, all program fetches are

directed to external memory.

On the AT89S52, if EA is connected to V

CC, program

fetches to addresses 0000H through 1FFFH are directed to

internal memory and fetches to addresses 2000H through

FFFFH are to external memory.

Data Memory

The AT89S52 implements 256 bytes of on-chip RAM. The

upper 128 bytes occupy a parallel address space to the

Special Function Registers. This means that the upper 128

bytes have the same addresses as the SFR space but are

physically separate from SFR space.

When an instruction accesses an internal location above

address 7FH, the address mode used in the instruction

specifies whether the CPU accesses the upper 128 bytes

of RAM or the SFR space. Instructions which use direct

addressing access of the SFR space.

For example, the following direct addressing instruction

accesses the SFR at location 0A0H (which is P2).

MOV 0A0H, #data

Instructions that use indirect addressing access the upper

128 bytes of RAM. For example, the following indirect

addressing instruction, where R0 contains 0A0H, accesses

the data byte at address 0A0H, rather than P2 (whose

address is 0A0H).

MOV @R0, #data

Note that stack operations are examples of indirect

addressing, so the upper 128 bytes of data RAM are avail-

able as stack space.

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ATMEL Corporation	AT89S52-24PC	478Kb / 39P	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

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