Matrix-orbital LCD2041 Legacy Manual de usuario descargar pdf (Pagina 22)

LCD2041 rev 2

6. Appendix: Command Summary

6.1 General

The operation of the LCD2041 is controlled by a simple and consistent command set. Commands control

 text display

 graphics display

 miscellaneous operating parameters

This chapter includes summary tables of all commands. Individual commands are discussed in detail in

Chapters 3 and 4 in the same sequence as in the following tables.

6.2 Issuing Commands

Commands are issued to the LCD2041 by the controller. In a test setup, commands can be issued to the

LCD2041 by means of a BASIC program, using the chr$( ) function. In the tables below, we've shown

commands in hex, ASCII and decimal form. All commands begin with the prefix character 0xFE (254

decimal). These commands are issued on the serial communications link (I

C or RS-232) at the currently

defined baud rate.

For example (using BASIC in a test setup), you could issue the command to clear the screen on the

LCD2041 by including the line:

PRINT#1,chr$(254);chr$(88)

in your BASIC program. Or with C you could (using Zcomm serial library)

ZComm1->WriteCommByte(0xfe);

ZComm1->WriteCommByte('X');

6.3 On Numbers

Like all computerized devices, the LCD2041 operates with commands and values in the form of binary

numbers. These binary numbers are arranged in 8 digit (i.e. 8 bit) groups called bytes. The decimal value of

a byte may have any value from 0 to 255.

Bytes are usually specified in either decimal or hexadecimal (base 16) form for convenience, since binary

numbers are confusing to deal with directly. Hexadecimal (hex) numbers are particularly convenient

because exactly two hexadecimal digits make up one byte, each hex digit representing 4 binary digits (4

bits) as shown here:

Binary Hex Decimal Binary Hex Decimal

0000 0 0 1000 8 8

0001 1 1 1001 9 9

0010 2 2 1010 A 10

0011 3 3 1011 B 11

0100 4 4 1100 C 12

0101 5 5 1101 D 13

0110 6 6 1110 E 14

0111 7 7 1111 F 15

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 28 29 30

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Matrix-orbital LCD2041 Legacy Manual de usuario Pagina 22