DM6806 datasheet(37/64 Pages) ETC

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4-7

Programming the DM5806

This section gives you some general information about programming and the DM5806 board, and then walks

you through the major DM5806 programming functions. These descriptions will help you as you use the example

programs included with the board. All of the program descriptions in this section use decimal values unless other-

wise specified.

The DM5806 is programmed by writing to and reading from the correct I/O port locations on the board. These

I/O ports were defined in the previous section. Most high-level languages such as BASIC, Pascal, C, and C++, and

of course assembly language, make it very easy to read/write these ports. The table below shows you how to read

from and write to I/O ports using some popular programming languages.

Language

Modulus

Integer Division

AND

a = b % c

a = b / c

a = b & c

a = b | c

Pascal

MOD

a := b MOD c

DIV

a := b DIV c

AND

a := b AND c

a := b OR c

BASIC

MOD

a = b MOD c

a = b \ c

AND

a = b AND c

a = b OR c

In addition to being able to read/write the I/O ports on the DM5806, you must be able to perform a variety of

operations that you might not normally use in your programming. The table below shows you some of the operators

discussed in this section, with an example of how each is used with Pascal, C, and BASIC. Note that the modulus

operator is used to retrieve the least significant byte (LSB) of a two-byte word, and the integer division operator is

used to retrieve the most significant byte (MSB).

Many compilers have functions that can read/write either 8 or 16 bits from/to an I/O port. For example, Turbo

Pascal uses Port for 8-bit port operations and PortW for 16 bits, Turbo C uses inportb for an 8-bit read of a port

and inport for a 16-bit read. Be sure to use only 8-bit operations with the DM5806!

Language

Read

Write

BASIC

Data=INP(Address)

OUT Address,Data

Turbo C

Data=inportb(Address)

outportb(Address,Data)

Turbo Pascal

Data:=Port[Address]

Port[Address]:=Data

Assembly

mov dx,Address

in al,dx

mov dx,Address

mov al,Data

out dx,al

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