Writing to Reserved Registers on the AFE5808A

Eric Tak

Other Parts Discussed in Thread: AFE5812, AFE5808A, AFE5808

Hi,

I have a CCA that uses a microcontroller (uC) to write/read registers in the AFE5808A, and am looking to see if I can use the same, unmodified uC code to work with an AFE5812. To make the AFE5812 "equivalent" to the AFE5808A, it appears I only need to disable the Demodulator in the AFE5812 by writing a '1' to register 22[0] (i.e. 0x16[0]). However, register 22[0] is reserved/unlisted for the AFE5808A; also, the AFE5808A data sheet says that "During register programming, all reserved/unlisted register bits need to be set as '0'".

My question is, will there be a problem if I write a '1' to register 22[0] on the AFE5808A?

Thanks,

Eric

over 9 years ago

0 Amy Schnoor over 9 years ago

TI__Mastermind 18285 points

Eric,

We have received your post and hope to respond back to you soon.

0 Chuck Smyth over 9 years ago

TI__Expert 6320 points

Eric,

The SPI communication for these two devices is the same expect for the SPI_Dig_EN pin, which controls writes to the DEMOD block. The bit you speak of is a reserved bit, so I would have to look into whether writing that bit in the AFE5808A would cause any harm.

Thanks,

Chuck Smyth

0 Eric Tak over 9 years ago in reply to Chuck Smyth

Prodigy 50 points

Thanks Chuck. I would appreciate an answer on whether writing a '1' to that reserved bit on the AFE5808 would cause any harm.

Regards,
Eric

0 Chuck Smyth over 9 years ago in reply to Eric Tak

TI__Expert 6320 points

Hi Eric,No this will not cause any harm.Thanks,Chuck

0 Eric Tak over 9 years ago in reply to Chuck Smyth

Prodigy 50 points

Thanks Chuck. That was exactly the answer I was hoping for.

Regards,

Eric

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Writing to Reserved Registers on the AFE5808A