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6.5. TIME RELATED SIGNAL PARAMETERS 175
T.I. Product
Processor
Family
Clock and Timer
Features
ez430-F2013 MSP430F2013 2xx
Basic Clock Module+
Timer_A, Timer_B
Watchdog Timer+
MSP-EXP430G2
14 pin - MSP430G2211
20 pin - MSP430G2231
2xx
Basic Clock Module+
Timer_A, Timer_B
Watchdog Timer+
MSP-EXP430FG4618
MSP-EXP430F5438
ez Chronos
MSP430FG4618
MSP430F5438
CC430F6137
4xx
5xx
6xx
FLL+ Clock Module
Basic Timer 1
Timer_A, Timer_B
Watchdog Timer
Watchdog Timer+
Real Time Clock
Unified Clock System
Watchdog Timer (WDT_A)
Timer_A, Timer_B
Real Time Clock
(RTC_A, RTC_B)
Unified Clock System
Watchdog Timer (WDT_A)
Timer_A
Real Time Clock (RTC_A)
Figure 6.1: MSP430 variants.
her controller appropriately. In the next section, we review time related terminology followed by
descriptions of the MSP430 clock system and the timer systems that take advantages of the multiple
clock sources.
6.5 TIME RELATED SIGNAL PARAMETERS
6.5.1 FREQUENCY
Consider a signal x(t) that repeats itself. We call this signal periodic with period T if it satisﬁes the
following equation:
x(t) = x(t + T).
To measure the frequency of a periodic signal, we count the number of times a particular event
repeats within a one second period. The unit of frequency is the Hertz or cycles per second. For

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