Clock Generator; Figure 6.3-2 Clock Generator Block Diagram - Nuvoton ISD94124BYI Technical Reference Manual

6.3.2

Clock Generator

Five clock sources can be used to drive all the internal clocks:

32.768 kHz external low speed crystal oscillator (LXT)

4~24.576 MHz external high speed crystal oscillator (HXT)

Programmable PLL output clock frequency (PLLFOUT), PLL source can be selected
from external 4~24.576 MHz external high speed crystal (HXT) or internal high speed
oscillator (HIRC)

Selectable 48.0 MHz or 49.152 MHz internal high speed RC oscillator (HIRC)

10 kHz internal low speed RC oscillator (LIRC)
X32_IN
X32_OUT
XT1_IN
XT1_OUT
Sep 9, 2019
ISD94100 Series Technical Reference Manual
LXTEN (CLK_PWRCTL[1])
External
32.768 kHz
Crystal
(LXT)
HXTEN (CLK_PWRCTL[0])
External
4~24.576 MHz
Crystal
(HXT)
HIRCEN (CLK_PWRCTL[2])
Internal
48.0/49.152 MHz
Oscillator
(HIRC)
LIRCEN (CLK_PWRCTL[3])
Internal
10 kHz
Oscillator
(LIRC)

Figure 6.3-2 Clock Generator Block Diagram

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LXT
HXT
PLLSRC (CLK_PLLCTL[19])
0
PLL FOUT
PLL
1
HIRC
LIRC
Rev1.09