Enhanced Modular Input/Output Subsystem (eMIOS)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
16-68
Freescale Semiconductor
As shown in
, when operating with trailing edge dead time insertion the first match between
A1 and the selected time base sets the output flip-flop to the value of the EDPOL bit and resets the internal
counter to 0x000001. In the second match between register A1 and the selected time base, the internal
counter is reset to 0x000001 and B1 matches are enabled. When the match between register B1 and the
selected time base occurs the output flip-flop is set to the complement of the EDPOL bit. This sequence
repeats continuously.
Figure 16-51. 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.
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
Содержание MPC5565
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