Texas Instruments MSP430 Student Guide

Clocking
Additional Clock Notes/Warnings
Here’s an assortment of notes and warnings about the clocks.
Other Clock Notes/Warnings
 Devices with shared IO’s for GPIO and XIN/XOUT:
 Configure the XIN/XOUT ports correct, if you forget this the Fault will
be still available.
 If using a loop or interrupt for clearing the fault flag you will loop
forever
 After clearing the fault flag in the Clock system successfully you need to
clear the OFIFG flag inside the SFR as well.
 If you don‘t do this you run always with the failsafe clock. Two stage
Fault logic is new for 5xx series
 If LFXT is disabled when entering into a low-power mode:

It is not fully enabled and stable upon exit from the low-power mode,
because its enable time is much longer than the wakeup time.
 If the application needs to keep LFXT enabled during a low-power
mode, the LFXTOFF bit can be cleared prior to entering the low-power
mode which causes LFXT to remain enabled.
 Similarly, the HFXTOFF bit can be cleared prior to entering the low-
power mode. This causes HFXT to remain enabled.
4 - 20 MSP430 Workshop - MSP430 Clocks & Initialization

Texas Instruments MSP430 Specifications

General

Brand	Texas Instruments
Model	MSP430
Category	Microcontrollers
Language	English