(2) each counter should have CLK (count pulse income) and OUT (output) and GATE (gating) three input/output end (see 8253 a timer/counter chip),
(3) of four channels should possess the function of the workings of a 8253 a 0, the other four channel should have the function that the workings of a 8253 a 3,
(4) the circuit should be designed with 51 single-chip microcomputer bus (sixteen 8-bit data bus, address bus and the read/write control line), 8 channel for addressing three address code and the circuit of the chip choose CS signal, (5) verify the circuit function, physical or circuit simulation,
CodePudding user response:
There are many counters on pudn demo