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To support the lowest power consumption and performance on-demand, the enhanced basic clock system (BCS+) on the MSP430F2xx (like all other MSP430 clock systems) typically provides two clocks. A low frequency auxiliary clock (ACLK) is typically sourced directly from a common 32 kHz watch crystal and is used for always-on low power peripherals. A high-speed clock is generated on-chip from an instant-on digitally controlled oscillator (DCO) used by the CPU and other peripherals. To save power, an application’s interrupt events steer the usage of the DCO only when required while the majority of the application’s life is spent in standby mode with high-performance available on-demand. Reduced standby power consumption also known as real-time clock (RTC) or LPM3 mode current has been reduced to less than 1 micro amp. This power consumption can be achieved using an external 32kHz crystal or the VLO which is a new very-low power oscillator (VLO) alternative to the typical 32kHz ACLK. The VLO provides a 12kHz on-chip oscillator with no external components. This feature is perfect for ultra-low power applications that need a wake-up function but require the precision of a 32kHz crystal. The F2xx crystal oscillator provides programmable integrated crystal load capacitors allowing the use of a wider range of crystals and elimination of external components used typically to stabilize oscillation. The failsafe crystal oscillator trigger is a non-maskable interrupt and starts the on-chip oscillator for failsafe operation. This feature is always available with no additional power consumption in both high-frequency and low frequency modes. The crystal min-pulse input de-glitch filters reduce the possibility of externally introduced high frequency system noise and improves reliability. Additionally, the improved on-chip digitally controlled oscillator (DCO) offers a sub 1 micro second start with +2.5% accuracies and 16MHz operation over the rated temperature and voltage ranges.
