NXP Semiconductors MPC5644A, Reference Manual, Page: 1598 / 1735

FlexRay Communication Controller (FlexRay)
MPC5644A Microcontroller Reference Manual, Rev. 6
1598 Freescale Semiconductor
33.6.17.2.2 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.
33.6.18 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 33-126 . The PE provides the slot status vector within the first macrotick after the end
of the related slot/window/NIT, as shown in Figure 33-158 .
Figure 33-158. Slot status vector update
NOTE
The slot status for the NIT of cycle n is provided after the start of cycle n+1.
cycle s
tart
sl
ot st
art
s
lot
st
art
symb
ol w
indow
MT
st
at
us
(N
IT)
MT
st
atu
s
(s
lo
t 1)
st
at
us
(s
lo
t k)
MT
st
atu
s
(s
lo
t n)
MT
NIT st
ar
t
st
at
us
(s
ym.win)
MT
cycle s
tart
st
atu
s
(N
IT
)
communication cycle
static segment dynamic segment symbol window NIT
slot 1
MT
st
ar
t