Attached you will find a 3-bit up/down counter as a subcircuit. The counter is made by an XSPICE state machine (ngspice manual chpt. 12.4.18). The internal event nodes are translated to analog inputs and outputs.The circuit in the *.cir file will run with standard ngspice. The subcircuit may be attached to an appropriate KiCAD symbol which has clock and up/down inputs and three outputs.
state-machine-3b-count.cir (1.2 KB) state-3bit-count.in (537 Bytes)
