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Appendix B: 8051 C Programming

ADVANTAGES AND DISADVANTAGES OF 8051 C

The advantages of programming the 8051 in C as compared to assembly are:

Offers all the benefits of high-level, structured programming languages such as C, including the ease of

writing subroutines

Often relieves the programmer of the hardware details that the complier handles on behalf of the

programmer

Easier to write, especially for large and complex programs

Produces more readable program source codes

Nevertheless, 8051 C, being very similar to the conventional C language, also suffers from the following

disadvantages:

Processes the disadvantages of high-level, structured programming languages.

Generally generates larger machine codes

Programmer has less control and less ability to directly interact with hardware

To compare between 8051 C and assembly language, consider the solutions to the Example—Write a program

using Timer 0 to create a 1KHz square wave on P1.0.

A solution written below in 8051 C language:

sbit portbit = P1^0;

/*Use variable portbit to refer to P1.0*/

main ( )

{

TMOD = 1;

while (1)

{

TH0 = 0xFE;

TL0 = 0xC;

TR0 = 1;

while (TF0 !=1);

TR0 = 0;

TF0 = 0;

portbit = !(P1.^0);

}

A solution written below in assembly language:

ORG

8100H

MOV

TMOD, #01H

;16-bit timer mode

LOOP:

MOV

TH0, #0FEH

;-500 (high byte)

MOV

TL0, #0CH

;-500 (low byte)

SETB

TR0

;start timer

WAIT:

JNB

TF0, WAIT

;wait for overflow

CLR

TR0

;stop timer

CLR

TF0

;clear timer overflow flag

CPL

P1.0

;toggle port bit

SJMP

LOOP

;repeat

END

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