ATMEL AT89C51 HAVE MANY SPECIAL FUNCTION REGISTERS
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NAME: "A"
FUNCTION: Accumulator
INTERNAL RAM ADDRESS: 0E0H
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NAME: "B"
FUNCTION: Arithmetic operation
INTERNAL RAM ADDRESS:0F0H
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NAME: "DPTR"
FUNCTION: used for accessing memory address for intenal and external code access and external data access.
NAME: "DPH"
FUNCTION:used for accessing internal memory.
INTERNAL RAM ADDRESS: 83H.
NAME " DPL"
FUNCTION:used for accessing external memory.
INTERNAL RAM ADDRESS:82H
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NAME:IE
FUNCTION:interrupt enable control.
INTERNAL RAM ADDRESS:0A8H
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NAME:IP
FUNCTION:interrupt priority.
INTERNAL RAM ADDRESS:0B8H
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NAME:PO
FUNCTION:port 0.input/output port 0 latch.
INTERNAL RAM ADDRESS:80H
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NAME:P1
FUNCTION:port 1 input/output ,port 1 latch.
INTERNAL RAM ADDRESS:90H
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NAME:P2
FUNCTION:port 2 latch.
INTERNAL RAM ADDRESS:A0H
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NAME:P3
FUNCTION:port 3 latch.
INTERNAL RAM ADDRESS:B0H.
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NAME:PCON
FUNCTION:power control
INTERNAL RAM ADDRESS:87H
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NAME:PSW
FUNCTION:program status word.
INTERNAL RAM ADDRESS:D0H
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NAME:SCON
FUNCTION:serial port control
INTERNAL RAM ADDRESS:98H
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NAME:SBUF
FUNCTION:serial port data buffer.
INTERNAL RAM ADDRESS:99H.
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NAME:SP
FUNCTION:serial stack pointer.
INTERNAL RAM ADDRESS:81H.
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NAME:TMOD
FUNCTION:timer/counter mode control register
INTERNAL RAM ADDRESS:89H
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NAME:TCON
FUNCTION:time/counter mode control signal.
INTERNAL RAM ADDRESS:88H
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NAME:TL0
FUNCTION:time zero lower bytes.
INTERNAL RAM ADDRESS:8AH
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NAME:TH0
FUNCTION:timer zero high bytes
INTERNAL RAM ADDRESS:8cH.
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NAME:TL1
FUNCTION:timer one lower byte.
INTERNAL RAM ADDRESS:85H.
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NAME:TH1
FUNCTION:timer one higher byte
INTERNAL RAM ADDRESS:8D
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