NXP Semiconductors MPC5644A, Reference Manual, Page: 860 / 1735

Enhanced Time Processing Unit (eTPU2)
MPC5644A Microcontroller Reference Manual, Rev. 6
860 Freescale Semiconductor
channel mode characteristics are fixed in the predefined modes, but can be individually programmed in
the user-defined channel mode.
A generic description of channel modes from the usage point of view can be found in Section 24.5.5.4.2,
Channel modes overview . Each mode is named with a mnemonic acronym for terse reference. The
individual programmed attributes of the user-programmable channel mode are also described.
The modes are used differently for input and output signals, as explained in Section 24.5.5.4.3, Predefined
Channel Modes on Input Signal Processing , and Section 24.5.5.4.4, Channel Modes on Output Signal
Generation . Modes also allow combining input processing and output generation in a single channel, as
exemplified in Section 24.5.5.4.5, Combining Input and Output Signals .
Section 24.5.5.4.1, Channel Mode Logic and Event Flags , shows a structural definition of channel logic
and its relation to channel modes. A dynamic, event-oriented view of each channel mode can be found in
Section 24.7.3, Predefined channel mode summary .
24.5.5.4.1 Channel Mode Logic and Event Flags
Figure 24-39 shows a more detailed diagram of channel mode logic. The logic shown here is not
necessarily identical to the actual channel logic implementation, but is equivalent with respect to
conditions for event blocking, enabling, capture, and service requests.
Signals MSR, TSR, MCAP, TCAP, M1ET, M1EM2, M1BM2, M2BM1, M2BT, T1BM1, T2BM1, TBM2
and T1ET2 are decoded from programmed channel mode PDCM in predefined modes, and come directly
from the UDCM register when user-defined mode is selected:
• TSR (1 bit) defines Service Requests issued by Transitions, as shown in Table 24-51 .
• MSR (2 bits) defines Service Requests issued by Matches, as shown in Table 24-50 .
• TCAP (1 bit) defines time base captures caused by Transitions, as shown in Table 24-51 .
• MCAP (1bit) defines time base captures caused by Matches, as shown in Table 24-52 .
• M1ET, M1EM2, M1BM2, M2BM1, M2BT, T1BM1, T2BM1, TBM2, T1ET2 (1 bit each) define
Match and Transition reciprocal blocking and enabling, as well as Transition ordering, as shown in
Table 24-53 and Table 24-54 .
Table 24-55 shows the decoded values of those control signals for each predefined channel mode. The first
column shows the mnemonic reference for the predefined channel modes described in the following
sections.
Changing PDCM or the UDCM when user mode is selected may set or reset any of the channel flags, or
issue captures and service requests, so it is advisable to switch channel modes only in a quiescent channel
state, with channel flags MRLEA/B, TDLA/B, MRLA/B cleared. Furthermore, an event flag asserted in
one mode may keep asserted after the mode programming change, even if the flag is impossible to be set
in the new mode.
Table 24-50. MSR[1:0] signals – Match Service Requests
Value MSR
00 issue no Service Requests on Matches
01 issue Service Request on Match B only