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)
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