MSP430F2618-EP Datasheet, PDF (14/92 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F2618- EP
MIXED SIGNAL MICROCONTROLLER
SLAS632 -- DECEMBER 2008
DMA controller
The DMA controller allows movement of data from one memory address to another without CPU intervention.
For example, the DMA controller can be used to move data from the ADC12 conversion memory to RAM. Using
the DMA controller can increase the throughput of peripheral modules. The DMA controller reduces system
power consumption by allowing the CPU to remain in sleep mode without having to awaken to move data to
or from a peripheral.
oscillator and system clock
The clock system in the MSP43x261x family of devices is supported by the basic clock module that includes
support for a 32768-Hz watch crystal oscillator, an internal very low-power low-frequency oscillator, an internal
digitally controlled oscillator (DCO), and a high-frequency crystal oscillator. The basic clock module is designed
to meet the requirements of both low system cost and low power consumption. The internal DCO provides a
fast turn-on clock source and stabilizes in less than 1 s. The basic clock module provides the following clock
signals:
D Auxiliary clock (ACLK), sourced from a 32768-Hz watch crystal, a high-frequency crystal, or a very
low-power LF oscillator
D Main clock (MCLK), the system clock used by the CPU
D Sub-Main clock (SMCLK), the subsystem clock used by the peripheral modules
The DCO settings to calibrate the DCO output frequency are stored in the information memory segment A.
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