Advanced Registers, Counters & Memory 16 components
3-Bit Up/Down Counter
A synchronous 3-bit counter that counts up or down depending on a direction input. T flip-flops toggle under combinational steering logic so all bits change on the same clock edge.
What You'll Learn
- Build a synchronous up/down counter from T flip-flops
- Derive toggle-enable (steering) logic
- Contrast synchronous and ripple counters
How It Works
A direction input selects up or down counting. T flip-flops all share one clock; combinational steering logic (T0=1, T1 depends on Q0 and direction, T2 on Q0,Q1 and direction) decides which flip-flops toggle, so every bit changes synchronously on the same edge.
Components Used
Real-World Applications
Address generators that scan forwards and backwards, timers that count up or down, and position counters for motors and encoders.