M4TKLG6AE Datasheet, PDF (82/144 Pages) List of Unclassifed Manufacturers – 32-bit Microcontroller

M4TK
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 a clock divider. The chip will not
enter Power-down mode until CPU sets the Power-down enable bit PDEN(CLK_PWRCTL[7]) and
Cortex^® -M4 core executes the WFI instruction. After that, chip enters Power-down mode and wait
for wake-up interrupt source triggered to leave Power-down mode. In Power-down mode, the
clock controller turns off the 4~20 MHz external high speed crystal (HXT) and 22.1184 MHz
internal high speed RC oscillator (HIRC) to reduce the overall system power consumption. The
Figure 6.3-1 shows the clock generator and the overview of the clock source control.
Jan. 06, 2016
Page 82 of 144
Rev.1.00