NXP Semiconductors MPC5644A, Reference Manual, Page: 715 / 1735

Reaction Module (REACM)
MPC5644A Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor 715
Table 23-20. REACM_MWBK field descriptions
Field Description
0
LOOP
Loop Control Bit
The LOOP Control bit indicates that the next Modulation Control Word accessed by the
reaction channel when a Modulation Word address increment event occurs should be
the one indicated by the Channel MODULATION_ADDR[5:0] register with no offset.
1 Loop back to initial channel modulation word
0 Increment to the next modulation word
1
IOSS
Initial Output State Selection
The IOSS bit indicates the state of the channel output pin when the Modulation Word
is just accessed by the reaction channel. This access occurs when the channel is
activated by a Timer Input Channel being asserted, by software using SWMC bit in the
REACM_CHCR or when the modulation phase advances, e.g. due to a timer event.
1 HOD[2:0] is initially used for chn_c, chn_b and chn_a respectively
0 LOD[2:0] is initially used for chn_c, chn_b and chn_a respectively
Note: IOSS must not be 0b0 when MM is 0b01(threshold-holdoff).
2 Reserved, should be cleared.
3–4
MM[1:0]
Modulation Mode
The MM[1:0] Modulation Mode field indicates the type of the modulation that is
executed by the channel.
Table 23-21 defines the modulation modes.
Note: IOSS must not be 0b0 when MM is 0b01(threshold-holdoff).
5 Reserved, should be cleared.
6–7
SM[1:0]
Sequencer Mode
The SM[1:0] field defines the event that makes the channel address the next
modulation word. This event can be a timer event or a threshold level event. Note that
the channel does not necessarily increment the Modulation Word address thus the
same Modulation Word is executed again in the new modulation sequence.
Table 23-22 defines the Sequencer modes.
Note: For time-out event selections, it is required the related time be greater than 64
clock cycles
8 Reserved, should be cleared.
9–11
HOD[2:0]
High Output Drive
The HOD[2:0] field defines the values driven on the chn_c, chn_b and chn_a channel
output pins, respectively, when the channel is at ON state.
Note: Set HOD[2:0]=LOD[2:0] when using threshold-threshold modulation together
with sequence advance, in order to avoid fast glitches during the sequence
advance
12 Reserved, should be cleared.
13–15
LOD[2:0]
Low Output Drive
The LOD[2:0] field defines the values driven on the chn_c, chn_b and chn_a channel
output pins, respectively, when the channel is at OFF state.
Note: Set HOD[2:0]=LOD[2:0] when using threshold-threshold modulation together
with sequence advance, in order to avoid fast glitches during the sequence
advance
16 Reserved, should be cleared.