74 16 1 has data insertion function. Before counting, set the output QD, QC, QB and QA to 1000, and then start counting to form a hexadecimal counter. When the count reaches 1 1 1, there will be a pulse carry signal.
Extended data
We usually study the decimal system in mathematics and are used to it. In fact, the same is true of binary system. Decimal system is a decimal one, and binary system is a binary one as the name implies.
Decimal numbers consist of ten numerical symbols "0, 1, 2, 3, 4, 5, 6, 7, 8, 9". In decimal system, we can't see the number symbol representing 10, because every decimal 1 has no number after 2 in binary system, and only 0 and 60 in binary system.
Baidu encyclopedia-hexadecimal