PWM timer1 period and update method configuration register.
TIMER1_PRESCALE | period of PT0_clk = Period of PWM_clk * (PWM_timer1_PRESCALE + 1) |
TIMER1_PERIOD | period shadow register of PWM timer1 |
TIMER1_PERIOD_UPMETHOD | Update method for active register of PWM timer1 period, 0: immediate, 1: TEZ, 2: sync, 3: TEZ | sync. TEZ here and below means timer equal zero event |