In RM0394 Rev 4 page 873/1600 field OCM1 is bits 6:4 which I count as 3 bits. But the description shows the settings as 4 bits with 16 choices.

[KiptonM]

For example: 1000: is Combined PWM Mode, 1111: is Asymmetric PWM Mode 2.

How do you fit 4 bits into 3 bit spaces?

Bit 7 is used for OC1CE, and Bit 3 is used for OC1PE so there is no space on either end for the extra bit.

[KiptonM]

I just checked RM0390 Rev 6 page 568/1347 and it has only 8 options for the 3 bits. Which makes sense.

[waclawek.jan]

Look at bit 16.

JW

[KiptonM · Accepted solution]

Ha! You are right. There is nothing in the text of the description of of OCM1 to look for the 4th bit elsewhere.

Thanks,

Kip