Omega Engineering OME-A8111 - Manual (Page 23)

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
OME-A-8111 Hardware Manual (ver.1.1, Jul/2003) 21