NXP Semiconductors MPC5644A Reference Manual page 850

Enhanced Time Processing Unit (eTPU2)
If a transition occurs simultaneously (after the filter) with the CHAN
assignment, PSS samples the new pin value. Therefore, if TDLA/B is
cleared simultaneously with the assignment CHAN := CHAN, the
occurrence of a transition at this very moment can still be tested with PSS.
PRSS – Pin Request Service Sample
Channel logic can, depending on its state and programmed mode, request service to the eTPU microengine
(see Section 24.5.1, Functions and
input signal PSTI is sampled into an internal channel flag PRSS. There is one such PRSS flag for each
channel (see Figure 24-37). Channel PRSS keeps its value until all its service request sources are cleared
and until a new service request rises.
The channel PRSS flag is sampled into the branch logic as the PRSS flag (see
time slot transition period, or whenever the CHAN register is written by microcode.
OBE – Output Buffer Enable control latch
OBE latch drives the Output Buffer Enable signal, which can be used (depending on MCU integration) to
control the output signal pad driver. Channel output comes disabled from reset. If ipp_obe_[1|2]([0-31])
from eTPU is used on MCU integration and a signal is desired to be output in a channel, OBE signal must
be set by microcode. Microcode field TBSA is used to set/reset the Output Buffer Enable control when
microcode field TBSA bit 3 is 1, according to
.
Microcode TBSA[2:0]
1. Output Buffer Enable: there is one independent OBE signal for each channel.
850
NOTE
threads). When the channel logic issues a service request, the filtered
Table 24-46
Table 24-46. TBSA Output Buffer control
000
001
111
other values
MPC5644A Microcontroller Reference Manual, Rev. 6
Table 24-113) during the
meaning when TBSA[3] = 1
enable output buffer
disable output buffer
do nothing
reserved
Freescale Semiconductor
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