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Operational Description of HRPWM

Table 5. Duty Cycle Range Limitation for 3 and 6 SYSCLK/TBCLK Cycles

PWM Frequency

(1)

3 Cycles 6 Cycles SYSCLKOUT

(kHz) Minimum Duty Minimum Duty

200 0.6% 1.2%

400 1.2% 2.4%

600 1.8% 3.6%

800 2.4% 4.8%

1000 3.0% 6.0%

1200 3.6% 7.2%

1400 4.2% 8.4%

1600 4.8% 9.6%

1800 5.4% 10.8%

2000 6.0% 12.0%

(1)

System clock - T

SYSCLKOUT

= 10 ns

System clock = TBCLK = 100 MHz

If the application demands HRPWM operation in the low percent duty cycle region, then the HRPWM can

be configured to operate in count-down mode with the rising edge position (REP) controlled by the MEP.

This is illustrated in Figure 7. In this case, low percent duty limitation is no longer an issue. However, there

will be a maximum duty limitation with same percent numbers as given in Table 5 .

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

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Pulse 280 Specifications Page 17