Texas Instruments MSP430

Operating Modes (Reset → Active)
Chapter Topics
MSP430 Clocks & Initialization .................................................................................................. 4-1
Operating Modes (Reset → Active) .......................................................................................... 4-3
BOR ....................................................................................................................................... 4-3
BOR → POR → PUC → Active (AM) ................................................................................... 4-4
Clocking..................................................................................................................................... 4-6
What Clocks Do You Need? ................................................................................................. 4-6
MCLK, SMCLK, ACLK .......................................................................................................... 4-8
Oscillators (Clock Sources) ................................................................................................... 4-9
Clock Details (by Device Family) ........................................................................................ 4-11
Using MSP430ware to Configure Clocking ......................................................................... 4-16
Additional Clock Features ................................................................................................... 4-18
DCO Setup and Calibration .................................................................................................... 4-21
How the DCO Works ........................................................................................................... 4-22
Factory Callibration (G2xx, FR5xx) ..................................................................................... 4-26
Runtime Calibration ............................................................................................................. 4-28
VLO 'Calibration' ................................................................................................................. 4-31
Other Initialization (WDT, PMM) ............................................................................................. 4-32
Watchdog Timer .................................................................................................................. 4-33
PMM with LDO, SVM, SVS, and BOR ................................................................................ 4-34
Operating Voltages ............................................................................................................. 4-36
Summary ............................................................................................................................. 4-37
Initialization Summary (template) ........................................................................................ 4-40
Lab Exercise ........................................................................................................................... 4-41
4 - 2 MSP430 Workshop - MSP430 Clocks & Initialization