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MEB/0404

Multiple Oscillator Clock System

Always-on

On demand

• In

< 6us

< 6us the DCO is active and stable

The MSP430 clock system is designed specifically for battery-powered measurement

applications.

•Multiple oscillators are utilized to provide both an ultra-low power standby mode, and “on-

demand” high-performance processing. The clock system is very flexible and allows the MSP430

to operate optimally from a single 32KHz crystal – with the internal digitally controlled oscillator

(DCO) used for the CPU and high-speed peripherals.

•A low frequency Auxiliary Clock (ACLK) is driven directly from a common 32KHz watch crystal

with no additional external components. The ACLK enables the MSP430’s ultra-low-power

standby mode (LPM3) and an embedded real-time clock function. In LPM3, the MSP430 typically

consumes 0.8uA.

•The integrated high-speed DCO can source the master clock (MCLK) used by the CPU and

high-speed peripherals. By design, the DCO is active and fully stable in less than 6 µs no

intermediate steps. This enables “instant on” high-performance processing – no long start-up for

a second crystal or 2-speed start-up required. Because the DCO is digitally adjustable with

software and hardware, stability over time and temperature are assured.

•To support non-low power applications, a high-speed crystal up to 8Mhz can also be used.

•It is also possible to operate the MSP430 with no crystal at all using just the internal DCO.

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Ultra Start 16xx Bedienungsanleitung Seite 10