Proteus的例子SAMPLES.rar

The following material is excerpted from:

The Microcontroller Idea Book

Circuits, Programs, & Applications

featuring the 8052-BASIC Microcontroller

by Jan Axelson

copyright 1994, 1997 by Jan Axelson

ISBN 0-9650819-0-7

Published by Lakeview Research

Distribution by International Thomson Publishing (ITP) in arrangement with

Phone: 608-241-5824

Fax: 608-241-5848

Email: jaxelson@lvr.com

World Wide Web: http://www.lvr.com

You may distribute this material if you agree to distribute it in full and unchanged and agree

to charge no fee for such distribution with the exception of reasonable media charges.

The author and publisher have used their best efforts in preparing this work and the

materials in it. The author built and tested the electronic circuits described, ran and tested

The reference uses the following typographic conventions:

KEYWORDS (boldface uppercase)

BASIC-52 keywords

placeholders (italics)

Variables, expressions, constants, or other information that you must supply

[optional items] (enclosed in square brackets)

repeating elements... (followed by ellipsis (three dots))

C = command mode

Add

expression - expression C,R

Subtract

expression * expression C,R

Multiply

expression / expression C,R

Divide

expression ** expression C,R

Less than test (relational operator)

Less than or equal test (relational operator)

expression >= expression C,R

Greater than or equal test (relational operator)

ABS (expression)C,R

expression .AND. expression C,R

Logical AND

system’s crystal frequency.

CALL integer C,R

Calls an assembly-language routine at the specified address in program memory.

CBY(expression)C,R

Retrieves the value at expression in program, or code, memory.

CHR(expression)C,R

Clears all interrupts evoked by BASIC. Disables ONTIME, ONEX1.

Continues executing program after STOP or

.

COS(expression)C,R

Returns the cosine of expression

PRINT option. Causes a carriage return, but no line feed, on the host display.

Reserves storage for an array. Default size is 11 (0-10). Size limits are 0-254.

DO: [program statements]: UNTIL relational expression R

Executes all statements between DO and UNTIL until relational expression is

FOR counter variable = start-count expression C,R

TO end-count expression [

STEP count-increment expression]: [program statements]:

NEXT [counter variable]

Executes all statements between FOR and NEXT the number of times specified by

the counter and step expressions.

FPROG, FPROG1-FPROG6 C

Like PROG, PROG1-PROG6, but using Intelligent programming algorithm.

FREE C,R

Returns the number of bytes of unused external data RAM.

GET R

Contains the ASCII code of a character received from the host computer’s key-

Causes BASIC-52 to jump to line number in the current program.

Forces BASIC-52 to wait for ONTIME or ONEX1 interrupt.