STC89LE53RC datasheet(158/165 Pages) STC

158 / 165 page

declares a 16-bit variable DPTR whose lower-byte address is at 82H. Checking through the 8051 architecture,

we find that this is the address of the DPL SFR, so again, the sfr16 data type makes it easier for us to refer to

the SFRs by name rather than address. There's just one thing left to mention. When declaring sbit, sfr, or sfr16

variables, remember to do so outside main, otherwise you will get an error.

In actual fact though, all the SFRs in the 8051, including the individual flag, status, and control bits in the

bit-addressable SFRs have already been declared in an include file, called reg51.h, which comes packaged with

most 8051 C compilers. By using reg51.h, we can refer for instance to the interrupt enable register as simply IE

rather than having to specify the address A8H, and to the data pointer as DPTR rather than 82H. All this makes

8051 C programs more human-readable and manageable. The contents of reg51.h are listed below.

/*--------------------------------------------------------------------------------------------------------------------

REG51.H

Header file for generic 8051 microcontroller.

-----------------------------------------------------------------------------------------------------------------------*/

sbit

IE1

= 0x8B;

sbit

IT1

= 0x8A;

sbit

IE0

= 0x89;

sbit

IT0

= 0x88;

/* IE */

sbit

= 0xAF;

sbit

= 0xAC;

sbit

ET1

= 0xAB;

sbit

EX1

= 0xAA;

sbit

ET0

= 0xA9;

sbit

EX0

= 0xA8;

/* IP */

sbit

= 0xBC;

sbit

PT1

= 0xBB;

sbit

PX1

= 0xBA;

sbit

PT0

= 0xB9;

sbit

PX0

= 0xB8;

/* P3 */

sbit

= 0xB7;

sbit

= 0xB6;

sbit

= 0xB5;

sbit

= 0xB4;

sbit

INT1

= 0xB3;

sbit

INT0

= 0xB2;

sbit

TXD

= 0xB1;

sbit

RXD

= 0xB0;

/* SCON */

sbit

SM0

= 0x9F;

sbit

SM1

= 0x9E;

sbit

SM2

= 0x9D;

sbit

REN

= 0x9C;

sbit

TB8

= 0x9B;

sbit

RB8

= 0x9A;

sbit

= 0x99;

sbit

= 0x98;

/* BYTE Register */

sfr

= 0x80;

sfr

= 0x90;

sfr

= 0xA0;

sfr

= 0xB0;

sfr

PSW

= 0xD0;

sfr

ACC

= 0xE0;

sfr

= 0xF0;

sfr

= 0x81;

sfr

DPL

= 0x82;

sfr

DPH

= 0x83;

sfr

PCON

= 0x87;

sfr

TCON

= 0x88;

sfr

TMOD = 0x89;

sfr

TL0

= 0x8A;

sfr

TL1

= 0x8B;

sfr

TH0

= 0x8C;

sfr

TH1

= 0x8D;

sfr

= 0xA8;

sfr

= 0xB8;

sfr

SCON

= 0x98;

sfr

SBUF

= 0x99;

/* BIT Register */

/* PSW */

sbit

= 0xD7;

sbit

= 0xD6;

sbit

= 0xD5;

sbit

RS1

= 0xD4;

sbit

RS0

= 0xD3;

sbit

= 0xD2;

sbit

= 0xD0;

/* TCON */

sbit

TF1

= 0x8F;

sbit

TR1

= 0x8E;

sbit

TF0

= 0x8D;

sbit

TR0

= 0x8C;

158

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