Specifications

© 2008-2012 Microchip Technology Inc. DS70323E-page 43-41
Section 43. High-Speed PWM
High-Speed PWM
43
43.5.5 Master Time Base/Synchronous Time Base
The PWM functionality in the master time base is illustrated in Figure 43-9.
Figure 43-9: Master Time Base Block Diagram
Some of the common tasks of the master time base are:
• Generates time reference for all the PWM generators
• Generates special event ADC trigger and interrupt
• Supports synchronization with the external SYNC signal
(SYNCI1/SYNCI2/SYNCI3/SYNCI4)
• Supports synchronization with external devices using the SYNCO signal
The master time base for a PWM generator is set by loading a 16-bit value into the Time Period
register (PTPER/STPER). In the Master Time Base mode, the value in the PHASEx and
SPHASEx registers provide phase shift between the PWM outputs.
The clock for the PWM
timer (PMTMR/SMTMR) is derived from the system clock.
M
U
X
SYNCSRC
PMTMR/
SEVTCMP/
1:1
1:16
PTPER/
SEVTPS
Reset
SYNCEN
SYNCI1
SYNCI2
SYNCOEN
SYNCO
Edge Detector
SYNCPOL
Special Event
Trigger to ADC
Synchronization Signal
PWM Clock
STPER
SMTMR
SSEVTCMP
SYNCI3
SYNCI4