Omega Engineering OME-A8111 用户手册

Table of Contents

1. Introduction_________________________________________________________ 4

1.1

General Description ___________________________________________________ 4

1.2

Features _____________________________________________________________ 4

1.3

Specifications _________________________________________________________ 5

Power Consumption _________________________________________________________ 5

Analog Inputs ______________________________________________________________ 5

A/D Converter _____________________________________________________________ 5

DA Converter ______________________________________________________________ 6

Digital I/O_________________________________________________________________ 6

Interrupt Channel ___________________________________________________________ 6

Programmable Timer/Counter _________________________________________________ 7

Applications _______________________________________________________________ 7

1.4

Product Check List ____________________________________________________ 7

2. Hardware Configuration ______________________________________________ 8

2.1

Board Layout_________________________________________________________ 8

2.2

I/O Base Address Setting _______________________________________________ 9

2.3

Jumper Setting ______________________________________________________ 10

JP1 : D/A Internal Reference Voltage Selection_____________________________________ 10

2.4

I/O Register Address__________________________________________________ 11

The 8254 Counter __________________________________________________________ 12

A/D Input Buffer Register ___________________________________________________ 12

D/A Output Latch Register ___________________________________________________ 13

D/I Input Buffer Register ____________________________________________________ 13

Clear Interrupt Request______________________________________________________ 14

A/D Gain Control Register ___________________________________________________ 14

A/D Multiplex Control Register _______________________________________________ 15

A/D Mode Control Register __________________________________________________ 16

A/D Software Trigger Control Register _________________________________________ 17

D/O Output Latch Register __________________________________________________ 18

2.5

Digital I/O __________________________________________________________ 19

2.6

8254 Timer/Counter __________________________________________________ 20

2.7

A/D Conversion ______________________________________________________ 21

A/D conversion flow__________________________________________________________ 22

OME-A-8111 Hardware Manual (ver.1.1, Jul/2003) 2