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Programming & Customizing PIC Micro
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       APPLICATION #10 Expanded I/O using 74165 & 74595 I.C  

It is ussually a common situation when we have used up all our I/O on our microcontroller but we still need to use additional I/O and what shall we do ? The following is one solution to this problem by expanding the number of I/O using shift register I.C like 74165 and 74595.

     Low Cost C Compilers ? PIC ~US$125   AVR ~US$199   68HC11 ~US$199


The following code, exp_io_c shows how to use the 74165.C and 74595.C libraries for extended input and output. When button S1 is pushed, LED 1 will toggle green. Button S2 will toggle LED 2. However, when both buttons are pushed, LED 3 will toggle green.

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