HPWM command and oscillator frequency

[RussMartin]

My PBP manual (p. 74 or 76, depending on version) gives a nice table showing the minimum frequency that can be generated with HPWM, depending on oscillator frequency.

But the lowest oscillator frequency (OSC) shown in that table is 4 MHz.

What happens to the minimum HPWM frequency if a lower oscillator frequency is programmed?

For example, what happens if I use (no matter why) 1 MHz? Is the minimum frequency still 245 Hz? Or is it scaled by 1/4 to 61.25 Hz?

(Has anyone actually played with this? Or should I ask the folks at ME Labs? Maybe I should just do a jiffy program and put the PWM pin on the oscilloscope . . . )