Difference between RAM[n].POWER, RAM[n].POWERSET and RAM[n].POWERCLR.

[pjrebordao]

It's not clear to me the difference between RAM[n].POWER, RAM[n].POWERSET and RAM[n].POWERCLR.
I'm assuming that you use RAM[n].POWER to read the contents of the registers and RAM[n].POWERCLR to set them.
Is it Ok ?

What about RAM[n].POWERSET, then ?

[awneil]

You haven't said what chip you're talking about; eg,

https://infocenter.nordicsemi.com/topic/ps_nrf9160/vmc.html#register.RAM-0-7.POWER

https://infocenter.nordicsemi.com/topic/ps_nrf52840/power.html?cp=4_0_0_4_2_4#register.RAM-0-8.POWER

I agree that the description there is poor.

Usually, with sets of registers like this.

• <register-name> is the actual register; 
• <register-name>+SET allows you to set specific bits in the  <register-name> without having to do a RMW
• <register-name>+CLR allows you to clear specific bits in the  <register-name> without having to do a RMW
• Often, there is also a <register-name>+TGL which allows you to toggle specific bits in the  <register-name> without having to do a RMW

["RMW" = Read-Modify-Write]

See this recent thread:

https://www.avrfreaks.net/comment/2953671#comment-2953671

also:

https://www.avrfreaks.net/comment/2106866#comment-2106866

https://www.avrfreaks.net/comment/2106931#comment-2106931

[pjrebordao]

Sorry, it's a nRF52840

[Amanda Hsieh]

Hi,

Yeah, the general naming rule is as Andrew's mention. 

When writing to POWERSET, you set the specific bits. When writing '1' to a field in POWERCLR, you clear the specific bit in POWER.

If you read the POWERSET or POWERCLR, it will return the content of the POWER register, but that might not necessarily match what you just wrote into POWERCLR for instance.

-Amanda H.

[awneil]

Amanda Hsieh said:

When writing to POWERSET, you set the specific bits. When writing '1' to a field in POWERCLR, you clear the specific bit in POWER

I really don't get how what's written in the Product Specification actually describes that?

To me, the description is totally opaque - even though I know what it's trying to say!

It seriously needs a re-write!

[Amanda Hsieh]

Thanks for pointing out that. I will report to the internal.

-Amanda H.