On the Rev B version of the datasheet, POWCON1 bits [11:8] are reserved.
However, if I clear POWCON1.8 = 0, the PWM doesn't work - it does when set to 1.
Can I have details of these POWCON1 bits?
Firstly, bit PWMCON1.8 has no affect on the PWM - I assume you mean PWMCON1.11?
POWCON1 bit 11 disables the clock to the PWM block when set to 0. Setting it to 1 enables the PWM block.
POWCON1 bits 10:9 divide the clock to the PWM block as follows:
00 – 41.78MHz
01 – 20.89MHz
10 – 10.44MHz
11 – 5.22MHz
This feature of disabling the clock to the PWM or, slowing down the clock to the PWM is useful for reducing Idd consumption.
The datasheet will be corrected later.
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