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ADV7511 reserved bits

Question asked by csaba on Nov 1, 2013
Latest reply on Nov 21, 2013 by GuenterL

I am using the serial port interface to the EVAL-ADV7612-7511 board to examine registers.

Reading register 0x16 here is the command & response:

>rdi2c 72 16

I2C Read: 61

 

The value 0x61 = 01100001, which has bit 6 set. The Programming Guide (RevG) [see attached image file] says bit 6 'Must be set to Default Value', which is 0. Does this bit read back as 1 and then must be cleared? Or is it really a don't-care?

 

I'd like to know whether it is ok for software to perform read-modify-write operations where we might need to set or clear just a single bit in a given register.  I'd like to avoid having to keep track of reserved bits and their default values on a register by register basis.

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