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As per my understanding, do you want to write to the External flash using your application code? or do you want to write the code while programming?
If it is the first thing then could you let me know which interface are you using to communicate with the external flash?
If you are using SPI based interface for communication with the external flash then it would be possible to implement non-blocking writes in the application. This can be done using the (SMIF) Serial Memory Interface. You can refer to the following link to see APIs available for implementing the same: https://infineon.github.io/psoc6pdl/pdl_api_reference_manual/html/group__group__smif.html
Auxiliary flash memory (which can also be used for Emulated EEPROM)- 32KB.
There are two types of writes possible for these memories: 1. Blocking writes (not required by you) and 2. Partially blocking writes.
You can refer to the Flash System Routine page in the PDL Documentation to see how Partially blocking writes can be implemented when writing to flash. Basically, the flash program APIs present have a configuration structure where it is possible to set blocking or non-blocking writes.
You can use this API in your application to perform non-blocking write operations.
