Assignment 3.2

1. For the Z8 port interface below, write the C statements that will initialize the PORT lines, as appropriate for the peripheral devices (ie. Switches are input devices, LEDs are output devices). Output lines should be configured for push-pull operation.

PCADDR = 0x01;

PCCTL = 0x80;

PCADDR = 0x03;

PCCTL = 0x00;

2. Write the C statement that will turn ON all three LEDs in the circuit below, while sending logic 0 to PORT lines that are not connected to an LED.

00001100b = 0C ----> PAOUT = 0x0C;

3. Write the C statements that will:

• assign the logic level of the switch to a char variable named “switch!”
• mask off all PORT lines that are not connected to the switch

• unsigned char "switch1";
• switch1 = PCIN;
• switch1 = switch1 & 0x80; //<-- 0x80 is-inbinary 10xx 00xx