#13.5.1
Combinational logic
Use of Boolean algebra related to truth tables and logic gates.
\(\bar{a} = \bold{not}~A \)
\(A ⋅ B = A~\bold{and}~B \)
\(A + B = A~\bold{or}~B \)
Identification and use of AND, NAND, OR, NOR, NOT and EOR gates in combination in logic circuits.
Construction and deduction of a logic circuit from a truth table.
The gates should be treated as building blocks. The internal structure or circuit of the gates is not required.
#13.5.2
Sequential logic
Counting circuits:
- Binary counter
- BCD counter
- Johnson counter.
Inputs to the circuits, clock, reset, up/down.
Outputs from the circuits.
Modulo-n counter from basic counter with the logic driving a reset pin.
The gates should be treated as building blocks. The internal structure or circuit of the gates is not required.
#13.5.3
Astables
The astable as an oscillator to provide a clock pulse.
Clock (pulse) rate (frequency), pulse width, period, duty cycle, mark-to-space ratio.
Variation of running frequency using an external RC network.
Knowledge of a particular circuit or a specific device (eg 555 chip) will not be required.