29.4.3.2.2 Partial Page Programming

To program only part of a page using the WP command, the following constraints apply:

Data to be programmed must be contained in integer multiples of 64-bit address aligned words.
64-bit words can be programmed only if all the corresponding bits in the Flash array are erased (at logical value ‘1’).

Attempting to write a new value in an already written 64-bit word will result in a corrupted word as seen by the ECC status flags after reading its content.

See Figure 29-9.

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