Question

To answer the questions below, look in the MSP430FR6989 Data Sheet (document: slas789c)

a) The VLO is an internal RC clock that has the lowest power consumption. What is the current drawn by VLO? What is the typical frequency and min/max frequency values of VLO? (page 44)

b) The MODOSC (Module Oscillator) is an internal RC clock. What is the current drawn by MODOSC? What is the typical frequency and min/max frequency values of MODOSC?

c) What is the typical resistor value (and min/max values) of the built-in resistor at the pins? (page 47)

d) What is the maximum current and corresponding power that can be drawn from the pin when Vcc=2.2V? What about Vcc=3.0V? (page 48)

e) Which vector has a higher interrupt priority Timer0_A’s A0 or A1 vector? Give the word address for each of these vectors. (page 78)

f) Which timer has higher interrupt priority, Timer0_A or Timer1_A? g) The variable P1DIR (like many others) is memory-mapped. To what address is this variable mapped? Compute the address in this way: base+offset = address. (page 135)

Answer 1

Answer for part a)- current drawn by VLO is 100 nA and typical frequency value is 9.4 KHz , min. frequency value is 6 KHz and max. frequency value is 14 KHz.

Answer for part b)- current drawn by MODOSC is 25 A and typical frequency value is 4.8 MHz, min. frequency value is 4 MHz and max. value is 5.4 MHz.

Answer for part c)- typical value of resistor is 35 K ohm and min. value is 20 K ohm and max. value is 50 K ohm.

Answer for part d)- max. current that can be drawn from pin at Vcc=2.2 V is 15 mA and corresponding power drawn is 33 mW. At Vcc =3 V current drawn is 28 mA and corresponding power is 84 mW.