216 6. TIMER SYSTEMS
desired events on external pins at a desired time. For example, the system can generate a logic change,
a pulse, a periodic pulse with a desired duty cycle. The timer system with its clock system and the
capture/compare capabilities allows programmers to implement any time critical applications using
6.13 REFERENCES AND FURTHER READING
• Texas Instruments MSP430F543x, MSP430F541x Mixed Signal Microcontroller (SLA612C).
Texas Instruments: 2010.
• Texas Instruments MSP-EXP430F5438 Experimenter Board (SLAU263D). Texas Instruments:
• Texas Instruments MSP430x4xx Family User’s Guide “RISC 16-Bit CPU” (SLAU056J). Texas
• Barrett S,Pack D (2010) Embedded Systems Design with the Atmel Microcontroller. Morgan
and Claypool Publishers.
• Texas Instruments MSP430FG461x Code Examples, slac118d, www.TI.com.
6.14 CHAPTER PROBLEMS
1. What is the motivation for having three clock signal generators and three different clocks in
2. To save power usage, how does one turn off the LFXT1CLK clock signal generator?
3. We want to conﬁgure the MCLK clock to run on the XT2CLK clock signal generator. Which
register should be modiﬁed? What value should be in the register?
4. Suppose the LFXT1CLK is connected to a high frequency watch crystal. Identify the register
and the particular bit to conﬁgure the LFX1CLK clock signal generator on a high frequency
5. How does one select the clock for the Basic Timer?
6. The Basic Timer 2 (BTCNT 2) has two scaling factors, which control register is used for the
two scaling factors?
7. What is the password value and where should you write it to access the Watchdog timer system