Alarm timer circuit

1. Brief Introduction The functions of the MC9S12XS128 timer module and the MC9S12DG128 ECT are completely similar. The following introduces the xs128 timer module using the ECT module. The HC12 Enhanced Capture Timer module adds some features to the HCS12 standard timer to expand its application range, especially

1. Enable the timer clock: RCC_APB1PeriphClockCmd();  For example:     RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE); //Enable timer 3 clock 2. Set the basic parameters of the timer (counting method, counting cycle, frequency division coefficient, etc.)  Note: ① The counting modes include TIM_CounterMode_Up