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. Note that when counting down in oneshot or periodic modes, the prescaler acts as a true prescaler and contains the least-significant bits of the count. When counting up in one-shot or periodic modes, the prescaler acts as a timer extension, and holds the most-significant bits of the count. In input edge count, input edge time, and PWM mode, the prescaler always acts as a timer extension, regardless of the count direction.
//
// The PWM works based on the following settings:
// Timer reload interval -> determines the time period of one cycle
// Timer match value -> determines the duty cycle
// range [0, timer reload interval]
// The computation of the timer reload interval and dutycycle granularity
// is as described below:
// Timer tick frequency = 80 Mhz = 80000000 cycles/sec
// For a time period of 0.5 ms,
// Timer reload interval = 80000000/2000 = 40000 cycles
// To support steps of duty cycle update from [0, 255]
// duty cycle granularity = ceil(40000/255) = 157
// Based on duty cycle granularity,
// New Timer reload interval = 255*157 = 40035
// New time period = 0.5004375 ms
// Timer match value = (update[0, 255] * duty cycle granularity)
//
#define TIMER_INTERVAL_RELOAD 40035 /* =(255*157) */
#define DUTYCYCLE_GRANULARITY 157
