Chapter 15 Pulse-Width Modulation Subsystem (PWMSS).

Enhanced PWM (ePWM) Module www.ti.com
15.2.2.3.2 Controlling and Monitoring the Time-Base Submodule
Table 15-11 lists the registers used to control and monitor the time-base submodule.
TBCNT
CTR = 0
CTR_dir
CTR_max
TBCLK
TBPRD
Period Shadow
TBPRD
Period Active
16
16
16
TBPHS
Phase Active Reg
CTR = PRD
Reset
Zero Counter
UP/DOWN Mode TBCTL[CTRMODE]
Dir
Max
clk
Load
TBCNT
Counter Active Reg
SYSCLKOUT Clock
TBCLK
Prescale
TBCTL[HSPCLKDIV]
TBCTL[CLKDIV]
Table 15-11. Time-Base Submodule Registers
Acronym Register Description Address Offset Shadowed
TBCTL Time-Base Control Register 0h No
TBSTS Time-Base Status Register 2h No
TBPHSHR HRPWM extension Phase Register (1)
TBCTL[PRDLD]
TBCTL[PHSEN]
TBCTL[SWFSYNC]
CTR = 0
CTR = CMPB
X
Disable
Sync
Out
Select
TBCTL[SYNCOSEL]
4h No
TBPHS Time-Base Phase Register 6h No
TBCNT Time-Base Counter Register 8h No
TBPRD Time-Base Period Register Ah Yes
(1) This register is available only on ePWM instances that include the high-resolution extension (HRPWM). On ePWM modules that
do not include the HRPWM, this location is reserved. See Section 15.1.2 to determine which ePWM instances include this
feature.
Figure 15-10 shows the critical signals and registers of the time-base submodule. Table 15-12 provides
descriptions of the key signals associated with the time-base submodule.
Figure 15-10. Time-Base Submodule Signals and Registers
EPWMxSYNCI
EPWMxSYNCO
1632 Pulse-Width Modulation Subsystem (PWMSS) SPRUH73E–October 2011–Revised May 2012
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