418 4-bit up/down binary counter
418 : 4-bit up/down binary counter
- Author: claudiotalarico
- Description: 4-bit up/down binary counter with enable and test mode
- GitHub repository
- Open in 3D viewer
- Clock: 50000000 Hz
How it works
4 bit up/down binary counter with enable
Pin Mapping
direction | pin name | function
----------+--------------+-------------------
in | clk | clk
in | rst_n | rst_n
in | ui_in[0] | test (test mode)
in | ui_in[1] | ud (up/down)
in | ui_in[2] | en (enable)
out | ui_out[3:0] | cnt[3:0] (count)
How to test
- Connect input pin EN to VDD
- Connect input pin TEST to GND
- Connect input pin UD to VDD or GND through a switch
- Connect input pin RST_N to an R-C startup circuit
- Connect input pin CLK to a 50 MHz square waveform
- Connect the output pins CNT[3:0] to 4 LEDs
External hardware
- switch
- 4 LEDs
- R-C startup circuit
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | test | cnt[0] | |
| 1 | ud | cnt[1] | |
| 2 | en | cnt[2] | |
| 3 | cnt[3] | ||
| 4 | |||
| 5 | |||
| 6 | |||
| 7 |