Texas Instruments MSP430

Clocking
FR58xx/FR59xx - Clock System (CS)
The Clock System (CS) used in the new “Wolverine” devices provides almost as much flexibility
as the UCS peripheral, although – as we’ll see later – it’s easier to configure.
Clock System (CS)
 CS found on Wolverine (FR58/59xx)
 Five independent clock sources
 Low Freq
 LFXT1 (32768 Hz crystal)
 VLO (10 kHz)
 LFMODCLK (MODCLK/128)
 High Freq
 XT1 (4 – 24 MHz crystal)
 XT2 (4 – 24 MHz crystal)
 DCO (Specific CAL range)
 MODCLK (Internal 5MHz)
 Notes:
 MODOSC provided to ADC12,
MODCLK and LFMODCLK
 LF and HF ranges for XT1
 Defaults:
 DCO = 1MHz
 ACLK = Only LF sources
 Failsafe's:
 XT1LF: LFMODCLK (~42kHz)
 XT1HF
or XT2: MODCLK (5MHz)
MSP430 Workshop - MSP430 Clocks & Initialization 4 - 15