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Thursday, July 27, 2006

Simple Input Port Expender Circuit

We can use PISO IC for increase input port of microcontroller
They can expender output port from three port to eight port

74LS165 are 8-Bit Parallel In/Serial Output Shift Registers
which shifts data in the direction of QA toward QH when clocked.
Parallel-in access is made available by eight individual direct data
inputs, which are enabled by a low level at the shift/load
input. These registers also feature gated clock inputs and
complementary outputs from the eighth bit.

C code for 74165