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MSPM0G3107: why POWER_STARTUP_DELAY is required

Part Number: MSPM0G3107
Other Parts Discussed in Thread: SYSCONFIG

Tool/software:

#define POWER_STARTUP_DELAY                                    (16)
SYSCONFIG_WEAK void SYSCFG_DL_initPower(void)
{
    DL_GPIO_reset(GPIOA);
    DL_UART_Main_reset(UART_0_INST);
    DL_GPIO_enablePower(GPIOA);
    DL_UART_Main_enablePower(UART_0_INST);
    delay_cycles(POWER_STARTUP_DELAY);
}
why POWER_STARTUP_DELAY is required. What should be exact value
Actually I am not getting my first 13byte on uart tx, when I jump from app1(ox2000) to app2(0x0000)using NVIC_systemReset(). This app2(0x0000) not transmitting first 13byte on uart