FlexRay Communication Controller (FlexRay)MPC5644A Microcontroller Reference Manual, Rev. 61598 Freescale Semiconductor33.6.17.2.2 Relative timer T2If the timer T2 is configured as a relative timer, the interrupt flag TI2_IF in the Protocol Interrupt FlagRegister 0 (FR_PIFR0) is set, when the programmed amount of macroticks MT[31:0], defined by Timer2 Configuration Register 0 (FR_TI2CR0) and Timer 2 Configuration Register 1 (FR_TI2CR1), hasexpired since the trigger or restart of timer 2. The relative timer is implemented as a down counter andexpires when it has reached 0. At the macrotick start event, the value of MT[31:0] is checked and thendecremented. Thus, if the timer is started with MT[31:0] == 0, it expires at the next macrotick start.33.6.18 Slot status monitoringThe CC provides several means for slot status monitoring. All slot status monitors use the same slot statusvector provided by the PE. The PE provides a slot status vector for each static slot, for each dynamic slot,for the symbol window, and for the NIT, on a per channel base. The content of the slot status vector isdescribed in Table 33-126. The PE provides the slot status vector within the first macrotick after the endof the related slot/window/NIT, as shown in Figure 33-158.Figure 33-158. Slot status vector updateNOTEThe slot status for the NIT of cycle n is provided after the start of cycle n+1.cycle startslot startslot startsymbol windowMT status(NIT)MT status(slot 1)status(slot k)MTstatus(slot n)MTNIT startstatus(sym.win)MTcycle startstatus(NIT)communication cyclestatic segment dynamic segment symbol window NITslot 1MTstart
