AT89C51RD2-UM データシートの表示（PDF） - Atmel Corporation

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AT89C51RD2-UM

8-bit Flash Microcontroller

Atmel Corporation 

3. SFR Mapping

The Special Function Registers (SFRs) of the AT89C51RD2/ED2 fall into the following

categories:

• C51 core registers: ACC, B, DPH, DPL, PSW, SP

• I/O port registers: P0, P1, P2, P3, PI2

• Timer registers: T2CON, T2MOD, TCON, TH0, TH1, TH2, TMOD, TL0, TL1, TL2, RCAP2L,

RCAP2H

• Serial I/O port registers: SADDR, SADEN, SBUF, SCON

• PCA (Programmable Counter Array) registers: CCON, CCAPMx, CL, CH, CCAPxH, CCAPxL

(x: 0 to 4)

• Power and clock control registers: PCON

• Hardware Watchdog Timer registers: WDTRST, WDTPRG

• Interrupt system registers: IE0, IPL0, IPH0, IE1, IPL1, IPH1

• Keyboard Interface registers: KBE, KBF, KBLS

• SPI registers: SPCON, SPSTR, SPDAT

• BRG (Baud Rate Generator) registers: BRL, BDRCON

• Clock Prescaler register: CKRL

• Others: AUXR, AUXR1, CKCON0, CKCON1

Table 3-1.

Mnemonic

ACC

B

PSW

SP

DPL

DPH

C51 Core SFRs

Add Name

E0h Accumulator

F0h B Register

D0h Program Status Word

81h Stack Pointer

82h Data Pointer Low Byte

83h Data Pointer High Byte

7

6

5

4

3

2

1

0

CY

AC

F0

RS1

RS0

OV

F1

P

Table 3-2.

Mnemonic

PCON

AUXR

AUXR1

CKRL

CKCKON0

CKCKON1

System Management SFRs

Add Name

87h Power Control

8Eh Auxiliary Register 0

A2h Auxiliary Register 1

97h Clock Reload Register

8Fh Clock Control Register 0

AFh Clock Control Register 1

7

SMOD1

DPU

-

-

-

-

6

5

SMOD0

-

-

M0

-

ENBOOT

-

-

WDTX2 PCAX2

-

-

4

POF

XRS2

-

-

SIX2

-

3

GF1

XRS1

GF3

-

T2X2

-

2

GF0

XRS0

0

-

T1X2

-

1

PD

EXTRAM

-

-

T0X2

-

0

IDL

AO

DPS

-

X2

SPIX2

4 AT89C51RD2/ED2

4235K–8051–05/08

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