Some resources to help you getting started with STM32 programming.
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The 74LS90 is a simple counter, i.e. it can count from 0 to 9 cyclically in its natural mode. It counts the input pulses and the output is received as a 4-bit binary number. The binary output is reset to 0000 at every tenth pulse and count starts from 0 again. A pulse is also generated (probably at pin 9) as it resets its output to 0000. The chip can count up to other maximum numbers and return to zero by changing the modes of 7490.