Here is what should be read on the page 1:
Normally, split-gate FLASH is programmed on a row basis and erased on a page basis. Also, an entire specified array can be mass erased. For the GZ8/16 and GR16, rows are 32 bytes and pages are 64 bytes (two rows of 32 bytes each).
The document is in the queue for correction.
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Cheers,
Alban.