Texas Instruments AM335 Series Technical Reference Manual

www.ti.com Enhanced PWM (ePWM) Module
Table 15-60. Time-Base Control Register (TBCTL) Field Descriptions (continued)
Bit Field Value Description
12:10 CLKDIV 0-7h Time-base Clock Prescale Bits. These bits determine part of the time-base clock prescale value.
TBCLK = SYSCLKOUT/(HSPCLKDIV × CLKDIV)
0 /1 (default on reset)
1h /2
2h /4
3h /8
4h /16
5h /32
6h /64
7h /128
9-7 HSPCLKDIV 0-7h High-Speed Time-base Clock Prescale Bits. These bits determine part of the time-base clock
prescale value.
TBCLK = SYSCLKOUT/(HSPCLKDIV × CLKDIV)
This divisor emulates the HSPCLK in the TMS320x281x system as used on the Event Manager
(EV) peripheral.
0 /1
1h /2 (default on reset)
2h /4
3h /6
4h /8
5h /10
6h /12
7h /14
6 SWFSYNC Software Forced Synchronization Pulse
0 Writing a 0 has no effect and reads always return a 0.
1 Writing a 1 forces a one-time synchronization pulse to be generated.
This event is ORed with the EPWMxSYNCI input of the ePWM module.
SWFSYNC is valid (operates) only when EPWMxSYNCI is selected by SYNCOSEL = 00.
5-4 SYNCOSEL 0-3h Synchronization Output Select. These bits select the source of the EPWMxSYNCO signal.
0 EPWMxSYNC:
1h CTR = 0: Time-base counter equal to zero (TBCNT = 0000h)
2h CTR = CMPB : Time-base counter equal to counter-compare B (TBCNT = CMPB)
3h Disable EPWMxSYNCO signal
3 PRDLD Active Period Register Load From Shadow Register Select
0 The period register (TBPRD) is loaded from its shadow register when the time-base counter,
TBCNT, is equal to zero.
A write or read to the TBPRD register accesses the shadow register.
1 Load the TBPRD register immediately without using a shadow register.
A write or read to the TBPRD register directly accesses the active register.
2 PHSEN Counter Register Load From Phase Register Enable
0 Do not load the time-base counter (TBCNT) from the time-base phase register (TBPHS)
1 Load the time-base counter with the phase register when an EPWMxSYNCI input signal occurs or
when a software synchronization is forced by the SWFSYNC bit.
1583
SPRUH73H–October 2011–Revised April 2013 Pulse-Width Modulation Subsystem (PWMSS)
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Texas Instruments AM335 Series Specifications

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Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English