System Circuitry Design Notes; Main Clock; Rtc Clock - Nuvoton ARM ARM926EL-S User Manual

System Circuitry design notes

1.3.1

Main Clock

The system clock circuit is formed by the feedback circuit inside the chip and the external 12MHz
crystal oscillation circuit. Recommended crystal connection mode and device parameters as shown in
the figure below.
Note: The chosen capacitance needs to match the load capacitance of the crystal oscillator
1.3.2

RTC Clock

N9H20K51N integrates the RTC function, the board needs to provide the RTC with the clock circuit,
the recommended Crystal connection mode and the device parameters as shown in the figure below.
Mar. 26, 2021
NuMaker-emWin-RDK-N9H20
Page 6 of 25 Rev 1.11