PXS20RM Datasheet, PDF (871/1368 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

FlexRay Communication Controller
26.6.17.2.1 Absolute Timer T2
If timer T2 is configured as an absolute timer, it has the same functionality timer T1 but the configuration
from Timer 2 Configuration Register 0 (FR_TI2CR0) and Timer 2 Configuration Register 1 (FR_TI2CR1)
is used. On expiration of timer T2, the interrupt flag TI2_IF in the Protocol Interrupt Flag Register 0
(FR_PIFR0) is set. If the timer 1 interrupt enable bit TI1_IE in the Protocol Interrupt Enable Register 0
(FR_PIER0) is asserted, an interrupt request is generated.
26.6.17.2.2 Relative Timer T2
If the timer T2 is configured as a relative timer, the interrupt flag TI2_IF in the Protocol Interrupt Flag
Register 0 (FR_PIFR0) is set, when the programmed amount of macroticks MT[31:0], defined by Timer
2 Configuration Register 0 (FR_TI2CR0) and Timer 2 Configuration Register 1 (FR_TI2CR1), has
expired since the trigger or restart of timer 2. The relative timer is implemented as a down counter and
expires when it has reached 0. At the macrotick start event, the value of MT[31:0] is checked and then
decremented. Thus, if the timer is started with MT[31:0] == 0, it expires at the next macrotick start.
26.6.18 Slot Status Monitoring
The CC provides several means for slot status monitoring. All slot status monitors use the same slot status
vector 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 is
described in Table 26-126. The PE provides the slot status vector within the first macrotick after the end
of the related slot/window/NIT, as shown in Figure 26-158.
slot 1
static segment
dynamic segment
symbol window
NIT
communication cycle
Figure 26-158. Slot Status Vector Update
NOTE
The slot status for the NIT of cycle n is provided after the start of cycle n+1.
Freescale Semiconductor
PXS20 Microcontroller Reference Manual, Rev. 1
26-159