MINI58LDE Datasheet, PDF (43/83 Pages) List of Unclassifed Manufacturers – 32-bit Microcontroller

MINI58DE
6.3 Clock Controller
6.3.1 Overview
The clock controller generates clocks for the whole chip, including system clocks and all
peripheral clocks. The clock controller also implements the power control function with the
individually clock ON/OFF control, clock source selection and clock divider. The chip enters
Power-down mode when Cortex^® -M0 core executes the WFI instruction only if the PDEN
(CLK_PWRCTL[7]) bit is set to 1. After that, chip enters Power-down mode and waits for wake-up
interrupt source triggered to exit Power-down mode. In Power-down mode, the clock controller
turns off the 4~24 MHz external high speed crystal (HXT) and 22.1184 MHz internal high speed
RC oscillator (HIRC) to reduce the overall system power consumption. The following figures show
the clock generator and the overview of the clock source control.
The clock generator consists of 3 sources as listed below:
 4~24 MHz external high speed crystal oscillator (HXT) or 32.768 kHz (LXT) external
low speed crystal oscillator
 Programmable PLL output clock frequency (PLL source can be selected from external
4 ~ 24 MHz external high speed crystal (HXT) or 22.1184 MHz internal high speed
oscillator (HIRC)) (PLL FOUT)
 22.1184 MHz internal high speed RC oscillator (HIRC)
 10 kHz internal low speed RC oscillator (LIRC)
XT1_IN
XT1_OUT
XTLEN (CLK_PWRCTL[1:0])
4~24 MHz HXT
or
32.768 kHz LXT
HIRCEN (CLK_PWRCTL[2])
HXT or LXT
PLLSRC (CLK_PLLCTL[19])
0
PLL
1
PLL FOUT
22.1184 MHz
HIRC
LIRCEN (CLK_PWRCTL[3])
HIRC
10 kHz
LIRC
LIRC
Legend:
HXT = 4~24 MHz external high speed crystal oscillator
LXT = 32.768 kHz external low speed crystal oscillator
HIRC = 22.1184 MHz internal high speed RC oscillator
LIRC = 10 kHz internal low speed RC oscillator
Figure 6.3-1 Clock Generator Block Diagram
Dec. 09, 2015
Page 43 of 83
Rev.1.02