MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
17-59
Figure 17-48. eMIOS PWMCB Mode Example — Trailing Dead Time Insertion
FLAG can be generated in the trailing edge of the output PWM signal when MODE[5] is cleared, or on
both edges when MODE[5] is set. If subsequent matches occur on A and B, the PWM pulses continue to
be generated, regardless of the state of the FLAG bit.
NOTE
In OPWMCB mode, FORCMA and FORCMB do not have the same
behavior as a regular match. Instead they force the output flip-flop to a
constant value which depends upon the selected dead time insertion mode,
lead or trail and the value of the EDPOL bit.
FORCMA has different behaviors depending on the selected dead time insertion mode. In leading dead
time insertion mode, writing one to FORCMA sets the output flip-flop to the compliment of EDPOL. In
trailing dead time insertion mode, the output flip-flop is forced to the value of EDPOL.
If FORCMB is set, the output flip-flop value depends on the selected dead time insertion mode. In leading
dead time insertion mode, FORCMB sets the output flip-flop to the value of EDPOL. In trailing dead time
insertion mode, the output flip-flop is forced to the compliment of EDPOL.
NOTE
Setting the FORCMA bit does not reset the internal time base to 0x000001
as a regular A1 match does. FORCMA and FORCMB have the same
behavior even in freeze or normal mode regarding the output flip-flop
transition.
The FLAG bit is not set in the case of the FORCMA, FORCMB or both bits being set at the same time.
EDPOL = 1
Internal
Internal Counter is
Dead-Time
A1 Value
A2 Value
B1 Value
B2 Value
Selected
0x000002
0x000004
0x000002
0x000004
0x000015
0x000015
0x000013
0x000013
0x000001
0x000002
0x000004
0x000015
0x000013
0x000020
Output Flip-Flop
FLAG Set Event
0x000001
Counter Bus
Time
Time
Time Base
Dead-Time
Set to 1 on A1 Match
Write to B2
Write to A2
Summary of Contents for MPC5553
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