Since the CLKSTATUS register did not exist in the NUC100An series, when the program executes
while((CLK->CLKSTATUS & CLK_CLKSTATUS_OSC22M_STB_Msk) == 0);
this will cause the program to enter an infinite loop.

The user can change to delay 5ms
CLK_SysTickDelay(5000);
to ensure a stable clock source.

The following table lists common sampling frequency in accordance with the formula of I?S clock sources. If the system only requires a sampling frequency, the clock source can be determined by an external crystal. If two or more sampling frequencies are required, most of the chips will be limited to...

In the process of developing applications, user often needs to use printf () to process messages for debugging. If the UART supported by the NuMicro? series is more than one, it can be determined by defining "retarget.c" in DEBUG PORT that printf() uses which set of UART for transmission. The defaul...

Before entering Power-down mode, the user needs to configure I/O pins based on the setting of peripheral applications. If the I/O pin function is set as PWM output, the output is high or low level depending on the state of the peripheral Power-down mode (at this time, it cannot be configured by GPIO...

Since the hard fault is an exception interrupt, user can search code address from the memory address recorded by a stack pointer before entering a hardfault handler, and find the hard fault according to the address. The steps are as follows: Get a starting address of the stack pointer in Debug mode;...

The hardware divider (HDIV) can use hardware circuit to perform division operation directly. Software is not required to translate division instructions into a large number of alternative operation instructions. In the applications requiring high degree of numerical computation, such as sensor value...

Some NuMicro? family series that support USB function are provided with the internal LDO which can convert 5V input voltage of VBUS into 3.3V output voltage and supply the 3.3V to a USB transceiver. When the USB function is used, the LDO output pin VDD33 needs to connect to the LDO output voltage ha...

To stabilize the LDO output voltage in a chip, an external capacitor needs to be connected to the LDO output pin LDO_CAP. The capacitor needs to be close to the LDO_CAP pin. If the chip series has multiple LDO output pins, each LDO output pin requires an external capacitor. According to different Nu...

The LDO mainly provides a stable operating voltage of 1.8V for use in internal circuit of a chip, including RC oscillator, SRAM, and Flash.
In consideration of chip operational stability, it is not recommended that LDO output be used to drive other external chips.

Depending on the NuMicro? Family series, there is a different default state of the GPIO for selection. Users can select the default state of a GPIO by setting the CIOINI(Config0[10]).
The following table lists the settings of CIOINI for each NuMicro? Family series: