AT89C51ED2-RDTUM datasheet(4/137 Pages) ATMEL

4 / 137 page

4235K–8051–05/08

AT89C51RD2/ED2

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.

C51 Core SFRs

Mnemonic

Add

Name

ACC

E0h

Accumulator

F0h

B Register

PSW

D0h

Program Status Word

RS1

RS0

81h

Stack Pointer

DPL

82h

Data Pointer Low Byte

DPH

83h

Data Pointer High Byte

Table 3-2.

System Management SFRs

Mnemonic

Add

Name

PCON

87h

Power Control

SMOD1

SMOD0

POF

GF1

GF0

IDL

AUXR

8Eh

Auxiliary Register 0

DPU

XRS2

XRS1

XRS0

EXTRAM

AUXR1

A2h

Auxiliary Register 1

ENBOOT

GF3

DPS

CKRL

97h

Clock Reload Register

CKCKON0

8Fh

Clock Control Register 0

WDTX2

PCAX2

SIX2

T2X2

T1X2

T0X2

CKCKON1

AFh

Clock Control Register 1

SPIX2

AT89C51ED2-RDTUM 数据表(PDF) 4 Page - ATMEL Corporation

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