303 PWM generator
303 : PWM generator
- Author: Matea Samuel
- Description: Generate pwm signal with configurable period - 12-bit - and duty cycle - 1%-99%.
- GitHub repository
- Open in 3D viewer
- Clock: 50000000 Hz
How it works
This design intend to be used like a PWM generator. It contains two 12-bit registers: one for duty cycle(duty_reg) respectively one for period(period_reg). When sel signal is set to "0" the duty_reg will be selected and when sel is "1" the period_reg is selected. If values for duty/period is set at the input, the value is written in the regs only after wr_en is set to "1". For duty cycle, will be used only 7 bits(from 0 to 6) the rest of the bits beeing 0 hardcoded. the value for period_rescan be set between 2-4095(on 12 bits).
How to test
Connect the output to the osciloscope and verify if the frequency and duty cycle correspond with your expectation.
External hardware
The external hardware will be only the wire used for the pwm_out and 14 inputs (uController, digital pattern generator etc.) to set the period, duty cycle, set and wr_en signals.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | in[0] | pwm_out | in[8] |
| 1 | in[1] | in[9] | |
| 2 | in[2] | in[10] | |
| 3 | in[3] | in[11] | |
| 4 | in[4] | ||
| 5 | in[5] | ||
| 6 | in[6] | sel | |
| 7 | in[7] | wr_en |