Excitation tables: T flip-flop
	Characteristic table:
		T flip-flop
		T	Q	Q+	Operation
		0	0	0	hold
		0	1	1	hold
		1	0	1	toggle
		1	1	0	toggle
	Excitation table:
		Q	Q+	T
		0	0	0		How do we keep the current value?
		0	1				Hold: T = 0
		1	0
		1	1	0