Hello Yoochi san,
Startup begins after the release of a reset source, or after the end of a power supply ramp. There are two main portions of startup: hardware startup and firmware startup. During hardware startup, the CPU is halted, and other resources configure the device. During firmware startup, the CPU runs code generated by PSoC Creator to configure the device. When startup ends, the device is fully configured, and its CPU begins execution of user-authored main() code. This parameter defines the time taken to complete this procedure. Now this parameter can be thought as the time taken by the system to become functional and work as expected after a reset. On a system level this can be also taken into consideration.
Thank you for your reply.
I understand how long it takes to reach the user main.c program.