Determine the values of PSC, CCR, and ARR registers to generate the signal below if timer clock is 80 MHz:
T = 100 us
W = 70 us
To calculate the values of the PSC, CCR, and ARR registers for the given signal parameters:
Timer Clock Frequency (f_clk) = 80 MHz
Time Period (T) = 100 us
Signal Width (W) = 70 us
1. Calculate the Period (ARR) register value:
ARR = (T * f_clk) - 1
ARR = (100 us * 80,000,000 Hz) - 1
ARR = 8,000 - 1
ARR = 7,999
2. Calculate the Prescaler (PSC) value:
PSC = (f_clk * T) / (ARR + 1)
PSC = (80,000,000 Hz * 100 us) / (7,999 + 1)
PSC = 8,000,000 / 8,000
PSC = 1,000
3. Calculate the Capture/Compare (CCR) register value for the end of the signal:
The signal starts at 0 and lasts for a width of 70 us, so the CCR value for the end of the signal is:
CCR_end = (W * f_clk) - 1
CCR_end = (70 us * 80,000,000 Hz) - 1
CCR_end = 5,600 - 1
CCR_end = 5,599
Therefore, the values of the PSC, CCR, and ARR registers to generate the given signal are:
PSC = 1,000
CCR = 5,599
ARR = 7,999