7/31/2023 0 Comments Cdock source![]() PLL7 - USB2 PLL (functional frequency MHz).PL元 - USB1 PLL (functional frequency MHz)*.PLL2 - System PLL (functional frequency MHz)*. ![]() PLL1 - ARM PLL (functional frequency MHz).There are 7 PLLs in the i.MXRT1060 platform, some with specific functions, for example, create a reference clock for the ARM Core, USB peripherals, etc. An external 32KHz clock source must be used since the internal oscillator is not precise enough for long term timekeeping. Also is used to be useful for quicker startup times and tampering prevention. The internal oscillator will provide clocks to the same on-chip modules as the external 32kHz oscillator. Oscillator internal oscillator is automatically multiplexed in the clocking system when the system detects a loss of clock.While the power consumption of this RC oscillator is much lower than the 24MHz crystal oscillator, one limitation of this RC oscillator module is that its clock frequency is not as accurate. The 24 MHz RC oscillator is a self-tuning circuit that will output the programmed frequency value by using the RTC clock as its reference. RC Oscillator lower-power RC oscillator module is available on-chip as a possible alternative to the 24 MHz crystal oscillator after a successful power-up sequence.This Oscillator should always be active when the chip is powered on. Crystal Oscillator RTC oscillators are either implemented with 32 kHz or 32.768 kHz crystals.The reference clock that generates this crystal oscillator provides an accurate clock source for all the PLL inputs. Crystal Oscillator of the serial IO modules depend on the fixed frequency of 24 MHz.Internal Clock Sources with external components These oscillators provide a fixed frequency for the several PLL’s inside this module. This submodule contains all the oscillators and several PLL’s that provide a clock source to the principal CMM module.įor example, the i.MX RT1060 device supports 2 internal oscillators that combined with suitable external quartz crystal and external load capacitors provide an accurate clock source, another 2 internal oscillators are available for low power modes and as a backup when the system detects a loss of clock. Clock Controller Module(CCM) Block Diagram ![]() The Clock Controller Module(CCM) facilitates the clock generation in the RT platforms, many clocking variations are possible and the maximum clock frequency for the i.MX RT1060 device is following image shows a block diagram of the CCM, the three marked sub-modules are important to understand all the clock path from the clock generation(oscillators or crystals) to the clock management for all the peripherals of the board.įigure 1. For more detailed information about the device hardware modules, please refer to your specific device Reference Manual. Keep in mind that the described hardware and management clock modules in this document are a general overview of the different platforms and the devices listed above are used as a reference example, some terms and hardware modules functionality may vary between devices of the same platform. The hardware used for this document is the following: It’s important to know the different clock sources available on our devices, modifying the default clock configuration may have different purposes since increasing the processor performance, achieving specific baud rates for serial communications, power saving, or simply getting a known base reference for a clock timer. This document describes the different source clocks and the main modules that manage which clock source is used to derive the system clocks that exists on the i.MX RT’s devices. ![]()
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