IS89C51 datasheet(10/48 Pages) ISSI

Part #	IS89C51

Description	CMOS SINGLE CHIP 8-BIT MICROCONTROLLER with 4-Kbytes of FLASH

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Manufacturer	ISSI [Integrated Silicon Solution, Inc]

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10 / 48 page

IS89C51

10

1-800-379-4774 — Integrated Silicon Solution, Inc.

MC016-1C

11/21/98

ISSI®

Table 2. Special Function Registers

Symbol

Description

Direct Address

Bit Address, Symbol, or Alternative Port Function

Reset Value

ACC(1)

Accumulator

E0H

E7

E6

E5

E4

E3

E2

E1

E0

00H

B(1)

B register

F0H

F7

F6

F5

F4

F3

F2

F1

F0

00H

DPH

Data pointer (DPTR) high

83H

00H

DPL

Data pointer (DPTR) low

82H

00H

AF

AE

AD

AC

AB

AA

A9

A8

IE(1)

Interrupt enable

A8H

EA

—

ES

ET1

EX1

ET0

EX0

0XX00000B

BF

BE

BD

BC

BB

BA

B9

B8

IP(1)

Interrupt priority

B8H

—

PS

PT1

PX1

PT0

PX0

XXX00000B

87

86

85

84

83

82

81

80

P0(1)

Port 0

80H

P0.7

P0.6

P0.5

P0.4

P0.3

P0.2 P0.1 P0.0

FFH

AD7

AD6

AD5

AD4

AD3

AD2

AD1

AD0

97

96

95

94

93

92

91

90

P1(1)

Port 1

90H

P1.7

P1.6

P1.5

P1.4

P1.3

P1.2 P1.1 P1.0

FFH

A7

A6

A5

A4

A3

A2

A1

A0

P2(1)

Port 2

A0H

P2.7

P2.6

P2.5

P2.4

P2.3

P2.2 P2.1 P2.0

FFH

AD15 AD14

AD13 AD12 AD11 AD10 AD9

AD8

B7

B6

B5

B4

B3

B2

B1

B0

P3(1)

Port 3

B0H

P3.7

P3.6

P3.5

P3.4

P3.3

P3.2 P3.1 P3.0

FFH

RD

WR

T1

T0

INT1 INT0 TXD RXD

PCON

Power control

87H

SMOD

—

GF1

GF0

PD

IDL

0XXX0000B

D7

D6

D5

D4

D3

D2

D1

D0

PSW(1)

Program status word

D0H

CY

AC

F0

RS1

RS0

OV

—

P

00H

SBUF

Serial data buffer

99H

XXXXXXXXB

9F

9E

9D

9C

9B

9A

99

98

SCON(1)

Serial controller

98H

SM0

SM1

SM2

REN

TB8

RB8

TI

RI

00H

SP

Stack pointer

81H

07H

8F

8E

8D

8C

8B

8A

89

88

TCON(1)

Timer control

88H

TF1

TR1

TF0

TR0

IE1

IT1

IE0

IT0

00H

TMOD

Timer mode

89H

GATE

C/

T

M1

M0

GATE

C/

T

M1

M0

00H

TH0

Timer high 0

8CH

00H

TH1

Timer high 1

8DH

00H

TL0

Timer low 0

8AH

00H

TL1

Timer low 1

8BH

00H

Notes:

1. Denotes bit addressable.

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