ELE3DEC: Digital Electronics and Controllers - BAUD Rate - Engineering Assessment Answer

Subject Code: ELE3DEC Internal Code: 1AHHCB

Engineering Assessment Answer

TASK: Question 1: The following waveform contains serial data in an 8N1 format. State the BAUD rate and the ASCII data send. ELE3DEC Question 2: Write an embedded C function to set up and start Timer0 to generate a 50kHz square- wave (with a 25% High/ 75% low) on P1.6. Assume the following: ELE3DEC • The timer should use UP Mode • The source clock (SMCLK) is 1MHz • Output mode should be set to “Set/Reset”. Question 3: Write an embedded C function to initialise the ADC to sample data as follows: ELE3DEC • ADC measurement should be on A4 • The ADC should work in polled mode • VREF+ and VSS used as the references • The pin should be enabled in the ADC10AE0 register • SMCLK with a clock divider of 8 should be Question 4: For each of the following write a single line of C Code to solve each of the problems: ELE3DEC • Set the top bit to ‘1’ in P1OUT • Clear the bottom bit in P2OUT • Flip (invert) bits 3 and 5 in the variable ‘a’ • Set bit 2 and clear bit 3 in the variable ‘b’ Question 5: • The following items are connected to an MSP430 Microcontroller (operating from 3.6V): ELE3DEC LED (1.7V, 20mA) on P2.1 LED (1.7V, 20mA) on P1.5 Button on P1.2 (using an external pull-up resistor) Speaker on P2.5 Button on P1.3 (using an external pull-up resistor) Draw a circuit which fits the description above and calculate values of resistors where appropriate. • Write two lines of code to set-up P1DIR and P2DIR for the circuit in question 1. Any unused pins should be set as outputs. Question 6: Write an embedded C function to implement the following truth table: ELE3DEC • A button is connected to P1.0 and an LED is connected to P2.0. Write code with PWM so that if the button is pressed the LED is on 60%, but if the button is not pressed the LED is on 10%. • For each of the following bit bashing operations state what the final result will be in the variable `r’ (an unsigned char): a) r = 0x6B | 0xA1; b) r = 0x22 ^ 0xC4; c) r = 0xB1 & ~0x27; d) r = 0xA1 >> 3; e) r = 0x1E & 0xF7; • Explain the concept of switch bounce and under what circumstances debouncing may be required.  ELE3DEC

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