1. Write a sequence of instructions to configure PA1, PB4, PA6, PA7 pins to be output, enable slew rate limit, disable inverted I/O, wired AND with pull-up, and disable input buffer.
2. Write a sequence of instructions to configure PB7, PB5, PB3, PB0 for input and PB6, PB4, PB2, PB1 for output.
3. Traffic light controller simulation. Use port C pins PC5~PC0 of the XMEGA128A1U and green, yellow, and red LEDs to simulate a trafficlight controller. The traffic patterns and durations for the east-west and north-south traffic are given in Table H4.3. Write a program to control the light patterns. Assume that the delay function delayby100ms is available for your call. The multiple of 100 ms is passed in r16. The subroutine setSysClkto32Mwith32MIntOsc is available for your call.
4. For the circuit shown in Figure 8.22, write a program to generate a waveform as shown in Figure HW4.4 from VOUTA. Assume that delay1ms subroutine is available. This subroutine delay1ms generates exactly 1 ms delay. The subroutine setSysClkto32Mwith32MIntOsc is available for your call.