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VLO Calibration on the MSP430FR4xx and MSP430FR2xx Family
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2016-12-08
张瑾
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MSP430FR4xx and MSP430FR2xx (FR4xx/FR2xx) family microcontrollers (MCUs) provide various clock sources, including some high-speed high-accuracy clocks and some low-power low-system-cost clocks. Users can select the best balance of performance, power consumption, and system cost. The on-chip very low-frequency oscillator (VLO) is a clock source with 10-kHz typical frequency included in FR4xx/FR2xx family MCUs. The VLO is widely used in a range of applications because of its ultra-low power consumption. Some applications require not only low power but also a higher-accuracy clock. This application report introduces the clock system in FR4xx/FR2xx family MCUs and then discusses how to calibrate VLO against an internal high-accuracy clock. Example code is provided that implements a VLO calibration solution, including test results to show how the solution improves timing accuracy while maintaining the low-power advantages of the VLO. Using a calibrated VLO also saves system cost compared to using an external crystal.
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