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Figure 23-40. Advancing modulation phase on a threshold level
In the example shown in
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
•
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.
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
Freescale Semiconductor
ON
timer
control
signal
OFF
Current in
Injector
i0
i2
i3
i4
i5
A
B
a
b
c
Figure 23-40
the Modulation Word 0 has the field SM = 11 meaning that it should
Figure 23-40
MPC5644A Microcontroller Reference Manual, Rev. 6
C
D
E
d
e
f
is described as follows:
NOTE
Reaction Module (REACM)
OFF
time
time
743
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