907 7-Seg 'Tiny Tapeout' Display
907 : 7-Seg 'Tiny Tapeout' Display
- Author: J. Rosenthal & htfab
- Description: This circuit will output a string of characters (’tiny tapeout’) to the 7-segment display.
- GitHub repository
- View in Wokwi
- Clock: 0 Hz
- Feedback: ✅ 1
How it works
The logic to light the characters appears in the bottom half of the simulation window. The top half of the simulation window implements a modulo-12 counter. In other words, the counter increments up to 11 then resets. This counter is used to determine which character we should output to the 7-segment display. The truth table for the design can be found in the Design Spreadsheet.
How to test
Turn all pins OFF, keep the clock running and watch the rolling text on the 7-segment display. Or turn pin 3 ON and manually select a letter using pins 4 to 7.
External hardware
None
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | segment a | ||
| 1 | reset (sync) | segment b | |
| 2 | segment c | ||
| 3 | clock override | segment d | |
| 4 | clock bit 3 | segment e | |
| 5 | clock bit 2 | segment f | |
| 6 | clock bit 1 | segment g | |
| 7 | clock bit 0 |
User feedback
- mattvenn: shows 'tiny tapeout' on the 7 seg