NXP Semiconductors MPC5644A, Reference Manual, Page: 743 / 1735

Reaction Module (REACM)
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 743
Figure 23-40. Advancing modulation phase on a threshold level
In the example shown in Figure 23-40 the Modulation Word 0 has the field SM = 11 meaning that it should
advance if the ADC comparator, which compares ADC results and threshold values, is true. This means
that the ADC result is greater or equal to the threshold value pointed by THRESPT Modulation Word 0
field. The advance from phase A to phase B in
Figure 23-40 is described as follows:
• Initially at time a the reaction channel output is loaded with HOD[2:0] as indicated by IOSS value,
both fields of modulation word 0.
• If ADC result

[THRESPT] the reaction channel turns the outputs off by loading LOD[2:0] to the
channel outputs and advance to the next modulation cycle at time b .
NOTE
The advance on threshold, SM = 11, is intended to be used with IOSS = 1,
thus the advance occurs when the level from the ADC is greater or equal to
the value pointed by THRESPT. IOSS = 0 is a reserved value for this bit in
this configuration and should not be used.
23.10.2 Controlling the loop function
The LOOP field in the Modulation Word controls the sequencing of Modulation Words to be executed by
the channel. If LOOP = 1 and a phase is ended the next Modulation Word address returns to the initial
D
a b c e d f
timer
control
signal
Current in
Injector
time
time
OFF
ON
OFF
A
B
C E
modulation word
0
modulation word
1
modulation word
2
modulation word
3
modulation word
4
i3
i2
i5
i4
eTPU
i0