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Overview
Table 2-1. Submodule Configuration Parameters (continued)
Submodule Configuration Parameter or Option
Event-trigger (ET)
• Enable the ePWM events that will trigger an interrupt.
• Enable ePWM events that will trigger an ADC start-of-conversion event.
• Specify the rate at which events cause triggers (every occurrence or every second or third
occurrence)
• Poll, set, or clear event flags
Code examples are provided in the remainder of this document that show how to implement various
ePWM module configurations. These examples use the constant definitions shown in Example 2-1 . These
definitions are also used in the C280x C/C++ Header Files and Peripheral Examples (SPRC191).
Example 2-1. Constant Definitions Used in the Code Examples
// TBCTL (Time-Base Control)
// = = = = = = = = = = = = = = = = = = = = = = = = = =
// TBCTR 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
// 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
SPRU791D – November 2004 – Revised October 2007 ePWM Submodules 21
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