7

Preliminary

Configuration Registers

The ISD5216 is a very versatile chip where the analog audio signal can be routed and processed

in a variety of ways. Writing to three configuration registers sets up the internal path.

To aid the setup of the signal paths, the available paths are displayed graphically and the

currently selected path highlighted in blue while the available but inactive paths are shown in

gray.

An arrow is only highlighted if there is a signal at the input end, and the signal can be accepted at

the other end. The easiest way to setup a path is from the signal input towards the output.

There are a number of ways to set up the path of analog audio, Note: The configuration

registers are not actually written to the chip until the ‘Write Config’ button is pressed:

1.

The controls on the main application window can be used to setup any path through the

system. Set all controls so that the desired path is highlighted and click ‘Write Config’ to

write the configuration to the chip. An arrow is only highlighted if there is a connection at

both ends of the arrow. To setup a configuration, start from the input and move towards

the outputs. For example, the paths to the CODEC will not be highlighted unless the A/D

converter is switched on.

2.

A value can be typed directly into the configuration register boxes. Pressing the load

button will update the graphics on the main display. The configuration register setup

should be written in hex numbers.

3.

The ‘Paths’ menu contains stored paths that will setup a given configuration. It is possible

to add and remove paths from this menu to save commonly used paths.

The currently selected configuration is displayed in three ways:

•

Graphically by highlighted arrows.

•

A hexadecimal number labeled ‘CFG0’, ‘CFG1 and ‘CFG2’

•

A binary number with the bit labels used in the datasheet

The buttons used for configuration register setup is:

Load - Update the current configuration with the settings in the textboxes in the top left

corner

Write Config – Write the settings currently selected to the chip.

Chip Select – Choose whether to use the main or secondary board