Pulse 280 Specifications download pdf (Page 11)

CTR=PRD

TBPRD shadow (16)

TBPRD active (16)

Counter

up/down

(16 bit)

TBCNT

active (16)

TBCTL[PHSEN]

TBCTL[SWFSYNC]

(software forced sync)

EPWMxSYNCI

CTR=ZERO

CTR_Dir

CTR=CMPB

Disabled

Sync

in/out

select

Mux

TBCTL[SYNCOSEL]

EPWMxSYNCO

TBPHS active (24)

TBPHSHR (8)

Phase

control

Time−base (TB)

CTR=CMPA

CMPA active (24)

CMPA shadow (24)

Action

qualifier

(AQ)

Counter compare (CC)

CMPB active (16)

CTR=CMPB

CMPB shadow (16)

CMPAHR (8)

EPWMA

EPWMB

Dead

band

(DB) (PC)

chopper

PWM

zone

(TZ)

Trip

CTR = ZERO

EPWMxAO

EPWMxBO

EPWMxTZINT

TZ1 to TZ6

HiRes PWM (HRPWM)

CTR = PRD

CTR = ZERO

CTR = CMPB

CTR = CMPA

CTR_Dir

Event

trigger

and

interrupt

(ET)

EPWMxINT

EPWMxSOCA

EPWMxSOCB

CTR=ZERO

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Operational Description of HRPWM

Figure 4. HRPWM System Interface

2.2 Configuring the HRPWM

Once the ePWM has been configured to provide conventional PWM of a given frequency and polarity, the

HRPWM is configured by programming the HRCNFG register located at offset address 20h. This register

provides configuration options for the following key operating modes :

Edge Mode — The MEP can be programmed to provide precise position control on the rising edge (RE),

falling edge (FE) or both edges (BE) at the same time. FE and RE are used for power topologies

requiring duty cycle control, while BE is used for topologies requiring phase shifting, e.g., phase

shifted full bridge.

Control Mode — The MEP is programmed to be controlled either from the CMPAHR register (duty cycle

control) or the TBPHSHR register (phase control). RE or FE control mode should be used with

CMPAHR register. BE control mode should be used with TBPHSHR register.

Shadow Mode — This mode provides the same shadowing (double buffering) option as in regular PWM

mode. This option is valid only when operating from the CMPAHR register and should be chosen to

be the same as the regular load option for the CMPA register. If TBPHSHR is used, then this option

has no effect.

SPRU924F– April 2005– Revised October 2011 High-Resolution Pulse Width Modulator (HRPWM)

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Pulse 280 Specifications Page 11

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