Chapter 6
Clock sources
The RT595 MCU has the capability to run up to 200 MHz. The board includes a 24 MHz crystal as the main external clock source
by default. It also supports an optional 26 MHz crystal.
Additionally, 32.768 kHz external crystal provides a clock source for the RTC.
Clocking sources included on this device are as follows:
• 192 MHz FRO
— Post-divider with 96 MHz, 48 MHz, 24 MHz, 12 MHz outputs.
— Digital feedback control block for frequency tuning.
— 192 MHz output and each of the divided outputs can be individually disabled.
• 96 MHz FRO
— Post-divider with 48 MHz, 24 MHz, 12 MHz, 6 MHz outputs.
— Digital feedback control block for frequency tuning.
— 96 MHz output and each of the divided outputs can be individually disabled.
• Main crystal oscillator with operating range of 4 MHz to 26 MHz.
• 32 kHz Real-Time Clock (RTC) oscillator that can optionally be used as a system clock.
• 1 MHz Low-Power Oscillator (LPOSC).
— LPOSC serves as the watchdog oscillator and clock for the OS/Event Timer and the Systick among others.
— It is also available as the system clock to both domains.
• Separate PLLs for Main Clock, DSP Clock, and Audio (Main clock and DSP clock PLLs are actually 2 PFD outputs from a
single PLL module).
For further information, see Chapter 6. Clock control on the Reference Manual.
NXP Semiconductors
MIMXRT595 EVK Board Hardware User's Guide, Rev. 0, 02/2021
User's Guide
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