When the NCO module is enabled, the NCO1INCU and
NCO1INCH registers should be written first, then the
NCO1INCL register. Writing to the NCO1INCL register
initiates the increment buffer registers to be loaded
simultaneously on the second rising edge of the
NCO_clk signal.
The registers are readable and writable. The increment
registers are double-buffered to allow value changes to
be made without first disabling the NCO module.
When the NCO module is disabled, the increment
buffers are loaded immediately after a write to the
increment registers.
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