NXP Semiconductors MPC5644A, Reference Manual, Page: 695 / 1735

Reaction Module (REACM)
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 695
Timer channels, such as eTPU channel outputs, are connected to the Channel Router. This submodule
routes each timer channel to a reaction channel. Note that one timer channel can be routed to more than
one reaction channel.
The modulation process starts when an ADC result arrives and the time window is active. The ADC Router
sends a trigger signal to all channels indicating that an ADC result is available. The channel address
resolution is based on the TAG field received with the incoming ADC result. After decoding the TAG field
the channel accesses the modulation word using the information stored in the REACM_CHCRn.
The Threshold Bank submodule stores values to be used on the comparison with incoming ADC results.
The address for the stored values is generated by the Modulation Control Word Bank. This address
generation is actually executed in a two-step process since the modulation word is first addressed by the
channel which then generates the address for the Threshold Bank. After having both inputs defined the
Comparator generates the comparison result back to the channels.
The Hold-off Timer Bank address is also stored in the modulation word. The reaction channel uses that
information for the modulation process which requires the output to remain OFF during a certain amount
of time. The hold-off counter itself is located inside each one of the channels.
23.2 Signal description
Table 23-2 shows the chip-level signals for the Reaction Module.
rch0_c eTPU21
rch1_a eTPU15
rch1_b eTPU9
rch1_c eTPU10
rch2_a eTPU16
rch2_b eMIOS2
rch2_c eMIOS4
rch3_a eTPU17
rch3_b eMIOS10
rch3_c eMIOS11
rch4_a eTPU18
rch4_b eTPU11
rch4_c eTPU12
rch5_a eTPU19
rch5_b eTPU28
rch5_c eTPU29
Table 23-1. Reaction module outputs (continued)
Reaction channel Output pin