Output Control Feature Precedence - Analog Devices SHARC ADSP-214 Series Hardware Reference Manual

PWMPERIOD 1
0
+
2
PWMCHA 1
PWM_AH
2xPWMDT
PWM_AL
PWM_AH
PWM_AL
(a) TRANSITION FROM NORMAL MODULATION TO FULL-ON, AT HALF-CYCLE BOUNDARY IN DOUBLE UPDATE MODE,
WHERE NO ADDITIONAL DEAD TIME IS NEEDED.
(b) TRANSITION FROM NORMAL MODULATION TO FULL-OFF, AT HALF-CYCLE BOUNDARY IN DOUBLE UPDATE MODE,
WHERE ADDITIONAL DEAD TIME IS INSERTED BY THE PWM CONTROLLER
Figure 7-4. Normal Modulation to Full ON to Full OFF Transition

Output Control Feature Precedence

The order in which output control features are applied to the PWM signal
is significant and important. The following lists the order in which the
signal features are applied to the PWM output signal.
1. Duty Cycle Generation
2. Crossover
3. Output Enable
ADSP-214xx SHARC Processor Hardware Reference
www.BDTIC.com/ADI
PWMPERIOD 1
2
PWMPERIOD
Pulse Width Modulation
FULL ON
FULL OFF
2xPWMDT
EMERGENCY DEAD TIME
INSERTED BY PWM CONTROLLER
PWMPERIOD
PWMTM 2
+
2
(a)
(b)
7-17