Ahh, my mistake. WP != PROT. Utilizing the PROT-pin appears to force memory chip's internal read&write protection flags active, causing read and write operation

Ahh, my mistake. WP != PROT. Utilizing the PROT-pin appears to force memory chip's internal read&write protection flags active, causing read and write operations to fail (unless I understood incorrectly). This kind of information could be beneficial to others if it's correct: You could add it to your post? Source: http://cache.nxp.com/documents/data_sheet/PCA24S08.pdf http://cache.nxp.com/documents/data_sheet/PCA24S08.pdf (Section 6.4 Access Protection)