Clocking
Oscillators (Clock Sources)
The typical MSP430 device provides a wide range of clock oscillator sources: internal/external,
fast/slow, higher precision vs lower cost. Looking at the diagram, we can see that the typical
sources are listed in the order from lower to higher frequency. Two slides from now, we'll
compare the essential differences between the oscillator clock sources.
Typical Clock Sources
Frequency
VLO
~10 KHz
REFO 32768 Hz
XT1
HF: 4-Max MHz
XT2 4-40 MHz
DCO
100 KHz to
CPU Max
MODOSC
5 MHz / 128
MODOSC
ACLK
SMCLK
MCLK
`
*Note: This is a general description, please refer to datasheet/UsersGuide for complete details regarding your device
Again, we caution you to examine the datasheet carefully to determine which oscillator clock
sources are available for your specific device. That said, the following table provides a quick
snapshot of what sources are available on each of the three MSP430 Launchpad’s.
Typical Clock Sources
Frequency
‘G2553
Value-line
‘F5529
USB
‘F5969
Wolverine
VLO
~10 KHz
REFO 32768 Hz
XT1
HF: 4-Max MHz
XT2 4-40 MHz
DCO
100 KHz to
CPU Max
MODOSC
5 MHz / 128
*Note: This is a general description, please refer to datasheet
MSP430 Workshop - MSP430 Clocks & Initialization 4 - 9
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