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TMS570LS0714
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SPNS226E – JUNE 2013 – REVISED NOVEMBER 2016
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TMS570LS0714
Peripheral Information and Electrical Specifications
Copyright © 2013–2016, Texas Instruments Incorporated
(1)
The filter width is 6 VCLK4 cycles.
7.2.4
Phase-Locking the Time-Base Clocks of Multiple ePWM Modules
The TBCLKSYNC bit can be used to globally synchronize the time-base clocks of all enabled ePWM
modules on a device. This bit is implemented as PINMMR37 register bit 1.
When TBCLKSYNC = 0, the time-base clock of all ePWM modules is stopped. This is the default
condition.
When TBCLKSYNC = 1, all ePWM time-base clocks are started with the rising edge of TBCLK aligned.
For perfectly synchronized TBCLKs, the prescaler bits in the TBCTL register of each ePWM module must
be set identically. The proper procedure for enabling the ePWM clocks is as follows:
1. Enable the individual ePWM module clocks (if disable) using the control registers shown in
Table 7-5
.
2. Configure TBCLKSYNC = 0. This will stop the time-base clock within any enabled ePWM module.
3. Configure the prescaler values and desired ePWM modes.
4. Configure TBCLKSYNC = 1.
7.2.5
ePWM Synchronization with External Devices
The output sync from the ePWM1 module is also exported to a device output terminal so that multiple
devices can be synchronized together. The signal pulse is stretched by eight VCLK4 cycles before being
exported on the terminal as the EPWM1SYNCO signal.
7.2.6
ePWM Trip Zones
7.2.6.1
Trip Zones TZ1n, TZ2n, TZ3n
These three trip zone inputs are driven by external circuits and are connected to device-level inputs.
These signals are either connected asynchronously to the ePWMx trip zone inputs, or double-
synchronized with VCLK4, or double-synchronized and then filtered with a 6-cycle VCLK4-based counter
before connecting to the ePWMx (see
Figure 7-4
). By default, the trip zone inputs are asynchronously
connected to the ePWMx modules.
Table 7-6. Connection to ePWMx Modules for Device-Level Trip Zone Inputs
TRIP ZONE
INPUT
CONTROL FOR
ASYNCHRONOUS
CONNECTION TO ePWMx
CONTROL FOR
DOUBLE-SYNCHRONIZED
CONNECTION TO ePWMx
CONTROL FOR
DOUBLE-SYNCHRONIZED AND
FILTERED CONNECTION TO
ePWMx
(1)
TZ1n
PINMMR46[18:16] = 001
PINMMR46[18:16] = 010
PINMMR46[18:16] = 100
TZ2n
PINMMR46[26:24] = 001
PINMMR46[26:24] = 010
PINMMR46[26:24] = 100
TZ3n
PINMMR47[2:0] = 001
PINMMR47[2:0] = 010
PINMMR47[2:0] = 100