Chapter 15 Pulse-Width Modulation Subsystem (PWMSS).

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Enhanced PWM (ePWM) Module www.ti.com Table 15-10. Submodule Configuration Parameters (continued) Submodule Configuration Parameter or Option Trip-zone (TZ) • Configure the ePWM module to react to one, all, or none of the trip-zone pins. • Specify the tripping action taken when a fault occurs: – Force EPWMxA and/or EPWMxB high – Force EPWMxA and/or EPWMxB low – Force EPWMxA and/or EPWMxB to a high-impedance state – Configure EPWMxA and/or EPWMxB to ignore any trip condition. • Configure how often the ePWM will react to each trip-zone pin: – One-shot – Cycle-by-cycle • Enable the trip-zone to initiate an interrupt. • Bypass the trip-zone module entirely. Event-trigger (ET) • Enable the ePWM events that will trigger an interrupt. • Specify the rate at which events cause triggers (every occurrence or every second or third occurrence) • Poll, set, or clear event flags High-Resolution PWM • Enable extended time resolution capabilities (HRPWM) • Configure finer time granularity control or edge positioning Code examples are provided in the remainder of this chapter that show how to implement various ePWM module configurations. These examples use the constant definitions shown in Example 15-1. Example 15-1. Constant Definitions Used in the Code Examples // TBCTL (Time-Base Control) // = = = = = = = = = = = = = = = = = = = = = = = = = = // TBCNT MODE bits #define TB_COUNT_UP 0x0 #define TB_COUNT_DOWN 0x1 #define TB_COUNT_UPDOWN 0x2 #define TB_FREEZE 0x3 // PHSEN bit #define TB_DISABLE 0x0 #define TB_ENABLE 0x1 // PRDLD bit #define TB_SHADOW 0x0 #define TB_IMMEDIATE 0x1 // SYNCOSEL bits #define TB_SYNC_IN 0x0 #define TB_CTR_ZERO 0x1 #define TB_CTR_CMPB 0x2 #define TB_SYNC_DISABLE 0x3 // HSPCLKDIV and CLKDIV bits #define TB_DIV1 0x0 #define TB_DIV2 0x1 #define TB_DIV4 0x2 // PHSDIR bit #define TB_DOWN 0x0 #define TB_UP 0x1 // CMPCTL (Compare Control) // = = = = = = = = = = = = = = = = = = = = = = = = = = // LOADAMODE and LOADBMODE bits #define CC_CTR_ZERO 0x0 #define CC_CTR_PRD 0x1 #define CC_CTR_ZERO_PRD 0x2 #define CC_LD_DISABLE 0x3 1628 Pulse-Width Modulation Subsystem (PWMSS) SPRUH73E–October 2011–Revised May 2012 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated
www.ti.com Enhanced PWM (ePWM) Module Example 15-1. Constant Definitions Used in the Code Examples (continued) // SHDWAMODE and SHDWBMODE bits #define CC_SHADOW 0x0 #define CC_IMMEDIATE 0x1 // AQCTLA and AQCTLB (Action-qualifier Control) // = = = = = = = = = = = = = = = = = = = = = = = = = = // ZRO, PRD, CAU, CAD, CBU, CBD bits #define AQ_NO_ACTION 0x0 #define AQ_CLEAR 0x1 #define AQ_SET 0x2 #define AQ_TOGGLE 0x3 // DBCTL (Dead-Band Control) // = = = = = = = = = = = = = = = = = = = = = = = = = = // MODE bits #define DB_DISABLE 0x0 #define DBA_ENABLE 0x1 #define DBB_ENABLE 0x2 #define DB_FULL_ENABLE 0x3 // POLSEL bits #define DB_ACTV_HI 0x0 #define DB_ACTV_LOC 0x1 #define DB_ACTV_HIC 0x2 #define DB_ACTV_LO 0x3 // PCCTL (chopper control) // = = = = = = = = = = = = = = = = = = = = = = = = = = // CHPEN bit #define CHP_ENABLE 0x0 #define CHP_DISABLE 0x1 // CHPFREQ bits #define CHP_DIV1 0x0 #define CHP_DIV2 0x1 #define CHP_DIV3 0x2 #define CHP_DIV4 0x3 #define CHP_DIV5 0x4 #define CHP_DIV6 0x5 #define CHP_DIV7 0x6 #define CHP_DIV8 0x7 // CHPDUTY bits #define CHP1_8TH 0x0 #define CHP2_8TH 0x1 #define CHP3_8TH 0x2 #define CHP4_8TH 0x3 #define CHP5_8TH 0x4 #define CHP6_8TH 0x5 #define CHP7_8TH 0x6 // TZSEL (Trip-zone Select) // = = = = = = = = = = = = = = = = = = = = = = = = = = // CBCn and OSHTn bits #define TZ_ENABLE 0x0 #define TZ_DISABLE 0x1 // TZCTL (Trip-zone Control) // = = = = = = = = = = = = = = = = = = = = = = = = = = // TZA and TZB bits #define TZ_HIZ 0x0 #define TZ_FORCE_HI 0x1 #define TZ_FORCE_LO 0x2 #define TZ_DISABLE 0x3 // ETSEL (Event-trigger Select) // = = = = = = = = = = = = = = = = = = = = = = = = = = // INTSEL, SOCASEL, SOCBSEL bits #define ET_CTR_ZERO 0x1 #define ET_CTR_PRD 0x2 #define ET_CTRU_CMPA 0x4 #define ET_CTRD_CMPA 0x5 #define ET_CTRU_CMPB 0x6 SPRUH73E–October 2011–Revised May 2012 Pulse-Width Modulation Subsystem (PWMSS) Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated 1629
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Chapter 15 Pulse-Width Modulation Subsystem (PWMSS).

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