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TMS570LS1114 Datasheet(PDF) 112 Page - Texas Instruments |
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TMS570LS1114 Datasheet(HTML) 112 Page - Texas Instruments |
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112 / 169 page  N2HET1 N2HET2 ePWM1 2VCLK4cycles PulseStrength ePWM1_SYNCI SYNCI EXT_LOOP_SYNC N2HET1_LOOP_SYNC ePWM1_SYNCI_SYNCED ePWM1_SYNCI_FILTERED PINMMR47[8,9,10] PINMMR36[25] TMS570LS1114 SPNS188B – OCTOBER 2012 – REVISED FEBRUARY 2015 www.ti.com 7.1.1 ePWM Clocking and Reset Each ePWM module has a clock enable (EPWMxENCLK). When SYS_nRST is active low, the clock enables are ignored and the ePWM logic is clocked so that it can reset to a proper state. When SYS_nRST goes in-active high, the state of clock enable is respected. Table 7-1. ePWMx Clock Enable Control ePWM Module Instance Control Register to Enable Clock Default Value ePWM1 PINMMR37[8] 1 ePWM2 PINMMR37[16] 1 ePWM3 PINMMR37[24] 1 ePWM4 PINMMR38[0] 1 ePWM5 PINMMR38[8] 1 ePWM6 PINMMR38[16] 1 ePWM7 PINMMR38[24] 1 The default value of the control registers to enable the clocks to the ePWMx modules is 1. This means that the VCLK4 clock connections to the ePWMx modules are enabled by default. The application can choose to gate off the VCLK4 clock to any ePWMx module individually by clearing the respective control register bit. 7.1.2 Synchronization of ePWMx Time Base Counters A time-base synchronization scheme connects all of the ePWM modules on a device. Each ePWM module has a synchronization input (EPWMxSYNCI) and a synchronization output (EPWMxSYNCO). The input synchronization for the first instance (ePWM1) comes from an external pin. Figure 7-1 shows the synchronization connections for all the ePWMx modules. Each ePWM module can be configured to use or ignore the synchronization input. Refer to the ePWM chapter in the TMS570LS12x/11x Technical Reference Manual (SPNU515) for more information. 7.1.3 Synchronizing all ePWM Modules to the N2HET1 Module Time Base The connection between the N2HET1_LOOP_SYNC and SYNCI input of ePWM1 module is implemented as shown in Figure 7-2. Figure 7-2. Synchronizing Time Bases Between N2HET1, N2HET2 and ePWMx Modules 112 Peripheral Information and Electrical Specifications Copyright © 2012–2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TMS570LS1114 |
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