AT89C51AC2 데이터 시트보기 (PDF) - Atmel Corporation

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AT89C51AC2

Enhanced 8-bit Microcontroller with 32 KB Flash Memory

Atmel Corporation 

SFR Mapping

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

categories:

Table 3. C51 Core SFRs

Mnemonic Add Name

7

6

5

4

3

2

1

0

ACC

E0h Accumulator

–

–

–

–

–

–

–

–

B

F0h B Register

–

–

–

–

–

–

–

–

PSW

D0h Program Status Word

CY

AC

F0

RS1

RS0

OV

F1

P

SP

81h Stack Pointer

–

–

–

–

–

–

–

–

Data Pointer Low

DPL

82h byte

–

–

–

–

–

–

–

–

LSB of DPTR

Data Pointer High

DPH

83h byte

–

–

–

–

–

–

–

–

MSB of DPTR

Table 4. I/O Port SFRs

Mnemonic Add Name

P0

80h Port 0

P1

90h Port 1

P2

A0h Port 2

P3

B0h Port 3

P4

C0h Port 4 (x2)

7

6

5

4

3

2

1

0

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

Table 5. Timers SFRs

Mnemonic Add Name

7

6

5

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

TMOD

89h

Timer/Counter 0 and

1 Modes

GATE1

C/T1#

M11

10 A/T89C51AC2

4

3

2

1

0

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

–

TR0

IE1

IT1

IE0

IT0

M01

GATE0

C/T0#

M10

M00

4127H–8051–02/08

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