https://devzone.nordicsemi.com/f/nordic-q-a/53405/write-1-2-3-bytes-into-serial-flash-by-qspiI use QSPI to access MT25qu512 serial flash and find the following behavior. SDK: nRF5_SDK_15.3.0_59ac345 QSPI configuration: // Use 4 bytes address from serial flash #define QSPI_CONFIG_ADDRMODE 1 // &lt;3=&gt; Read4O #define QSPI_CONFIG_READOC 3 en-USTelligent Community 13Fri, 18 Oct 2019 11:46:49 GMThttps://devzone.nordicsemi.com/thread/215700?ContentTypeID=1Fri, 18 Oct 2019 11:46:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:323c992f-c5cc-4981-8c38-f9a447cd6a8ehaakonsh<p>Jupp, to addresses that are word-aligned to the external memory&#39;s address space. Ie. 0x0000, 0x0004, 0x0008, 0x000C, etc.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/215697?ContentTypeID=1Fri, 18 Oct 2019 11:42:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b37ead94-d444-4596-b31e-c5dff8f1d067Shang Ting<p>Does it mean I have to read/write 4/8/12/... bytes?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/215694?ContentTypeID=1Fri, 18 Oct 2019 11:35:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:01298675-0a59-4b53-bdaa-95363284453bhaakonsh<p>All memory accesses by the QSPI peripheral to external memories have to be word-aligned to<span>&nbsp;the external memory&#39;s address space, and you can only</span>&nbsp;read or write&nbsp;full words, usually 32bits(4 bytes).&nbsp;</p><div style="clear:both;"></div>