In the past, D-type flip-flops are used more frequently than JK-type flip-flops.
Although in some cases, such as generate a special data series,
JK-type flip-flops might have advantages of simpler combinatorial logic implementation.
This could be the reason why people graduately forgot JK-type flip-flops.
Nowadays, with the emergence and rapid development of MCUs,
flip-flops, and cominatorial logics, could be needed in schools for education purposes only.
Like this case, if a MCU is involved in the design,
the D-type flip-flops chip is just an unnecessary redundent.
Mr. X is good at theory, So is Mr. H.
However, they are still forcusing on fighting with each other
to prove what only few people could understand.
They will not be invited to join our discussion
until they stop their fighting and try to forcusing on
contributing and sharing ideas with their knowledge.