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Example 2-1. Constant Definitions Used in the Code Examples (continued)

#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
#define	ET_CTRD_CMPB	0x7

//ETPS (Event-trigger Prescale)

//= = = = = = = = = = = = = = = = = = = = = = = = = =

//INTPRD, SOCAPRD, SOCBPRD bits

#define	ET_DISABLE	0x0
#define	ET_1ST	0x1
#define	ET_2ND	0x2
#define	ET_3RD	0x3

22 ePWM Submodules SPRU791D–November 2004–Revised October 2007

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