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2.7 A/D Conversion

This section explains how to perform A/D conversions. The A/D conversion

can be performed by software trigger by pacer trigger. At the end of the

A/D conversion, it is possible to transfer data by polling and interrupt

before using the A/D conversion function; users should notice the following

issues:

z A/D data register, BASE+4/BASE+5, stores the A/D conversion data (sec. 2.4.2)

z A/D gain control register, BASE+9, select gain (sec. 2.4.6)

(

sec. 2.4.7

)

z A/D multiplex control register, BASE+A, select analog input

z A/D mode control register, BASE+B, select trigger type and transfer

type (sec. 2.4.8)

z A/D software trigger control register, BASE+C (sec. 2.4.9)

The block diagram is given below:

Base+C

OME-A-8111

Base+B

Base+A Base+9 Trigger

Logic

CPU Transfer

Logic

Memory

Buffer

12 bits

A/D

Gain

Control

7 to 0

Multi-

plexer

CN1

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