T89C51AC2 datasheet(10/117 Pages) ATMEL

Part #	T89C51AC2

Description	Enhanced 8-bit Microcontroller with 32 KB Flash Memory

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Manufacturer	ATMEL [ATMEL Corporation]

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10

T89C51AC2

4127D–8051–02/03

SFR Mapping

The Special Function Registers (SFRs) of the T89C51AC2 fall into the following

categories:

Table 3. C51 Core SFRs

Mnemonic

Add

Name

7

6543

210

ACC

E0h

Accumulator

–––

––

B

F0h

B Register

–––

––

PSW

D0h Program Status Word

CY

AC

F0

RS1

RS0

OV

F1

P

SP

81h

Stack Pointer

–––

––

DPL

82h

Data Pointer Low

byte

LSB of DPTR

–––

––

DPH

83h

Data Pointer High

byte

MSB of DPTR

–––

––

Table 4. I/O Port SFRs

Mnemonic

Add

Name

7

6543

210

P0

80h

Port 0

–––

––

P1

90h

Port 1

–––

––

P2

A0h

Port 2

–––

––

P3

B0h

Port 3

–––

––

P4

C0h Port 4 (x2)

–––

––

Table 5. Timers SFRs

Mnemonic

Add

Name

7

6543

210

TH0

8Ch

Timer/Counter 0 High

byte

–––

––

TL0

8Ah

Timer/Counter 0 Low

byte

–––

––

TH1

8Dh

Timer/Counter 1 High

byte

–––

––

TL1

8Bh

Timer/Counter 1 Low

byte

–––

––

TH2

CDh

Timer/Counter 2 High

byte

–––

––

TL2

CCh

Timer/Counter 2 Low

byte

–––

––

TCON

88h

Timer/Counter 0 and

1 control

TF1

TR1

TF0

TR0

IE1

IT1

IE0

IT0

TMOD

89h

Timer/Counter 0 and

1 Modes

GATE1

C/T1#

M11

M01

GATE0

C/T0#

M10

M00

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