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AN-203

Part Number	AN-203
Manufacturer	ZBasic
Description	I/O Expansion
Published	Feb 5, 2014
Detailed Description	ZBasic AN-203 I/O Expansion Techniques Introduction Application Note On more complex projects it is often the case tha...
Datasheet	AN-203 PDF File

Overview

ZBasic AN-203 I/O Expansion Techniques Introduction Application Note On more complex projects it is often the case that more I/O lines are needed than the number that are available on the chosen processor.
In this situation, you might first try to redesign the application to require fewer I/O lines.
For example, you may be able to use a given output for multiple purposes.
If you still need additional I/O lines, there are several techniques that you might employ, separately or in combination, to solve the problem.
Although the examples given in this application note are based on the ZX-24, the principles can be equally well applied to the other ZX processors.
Using a Multiplexer for Multiple Inputs If your application has a number of signals that only need to be connected to the processor when it is time to read the input, you may benefit from utilizing an external digital multiplexer.
These devices allow 1 of N input signals to be selected for passing on to the processor, where N is...

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