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AT89C4051

1001D–06/01

Special Function

Registers

A map of the on-chip memory area called the Special Function Register (SFR) space is

shown in the table below.

Note that not all of the addresses are occupied, and unoccupied addresses may not be

implemented on the chip. Read accesses to these addresses will in general return ran-

dom data, and write accesses will have an indeterminate effect.

User software should not write 1s to these unlisted locations, since they may be used in

future products to invoke new features. In that case, the reset or inactive values of the

new bits will always be 0.

Table 1. AT89C4051 SFR Map and Reset Values

0F8H 0FFH

0F0H B

00000000

0F7H

0E8H 0EFH

0E0H ACC

00000000

0E7H

0D8H 0DFH

0D0H PSW

00000000

0D7H

0C8H 0CFH

0C0H 0C7H

0B8H IP

XXX00000

0BFH

0B0H P3

11111111

0B7H

0A8H IE

0XX00000

0AFH

0A0H 0A7H

98H SCON

00000000

SBUF

XXXXXXXX

9FH

90H P1

11111111

97H

88H TCON

00000000

TMOD

00000000

TL0

00000000

TL1

00000000

TH0

00000000

TH1

00000000

8FH

80H SP

00000111

DPL

00000000

DPH

00000000

PCON

0XXX0000

87H

1 2 3 4 5 6 7 8 9 10 ... 17 18

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