MKMxxZxxACxx5 Bare Metal Software Drivers  R4.1.6
Reference Manual
SIM System Clock Modes

Overview

List of system clock operating modes.

Warning
Clock limitations:
Clock name Run mode clock frequencyVLPR mode clock frequency
System clock Up to 50 MHz Up to 2 MHz
Bus clock Up to 25 MHz Up to 1 MHz
Flash clock Up to 25 MHz Up to 1 MHz

Macros

#define SYSCLK_MODE0
 SYSCLK:BUSCLK:FLASHCLK = 1:1:1.
 
#define SYSCLK_MODE1
 SYSCLK:BUSCLK:FLASHCLK = 2:1:1.