C code for 74165

74165 can use for expender input port of microcontroller
74165 are 8-Bit Parallel In/Serial Output Shift Registerswhich shifts data
in the direction of QA toward QH when clocked.Parallel-in access is made
available by eight individual direct datainputs, which are enabled by a low
level at the shift/loadinput. These registers also feature gated clock inputs
and complementary outputs from the eighth bit.
Timing diagram for read data

C code for control 74165 by microcontroller

74165 to microcontroller circuit