EE 476: Homework 5

Due At the start of your 5th lab.

  1. For the simple DAC circuit shown in Lab 4, each port output pin can be at Vcc=5 volts or at zero volts.
    1. Show that if the port output is 0x80 that the voltage going to the oscilloscope equals 2.5 volts.
    2. Show that if the port output is 0x40 that the voltage going to the oscilloscope equals 1.25 volts.

  2. Show that the 16 table values for sine wave amplitude given in the example program are correct to 8 bits.

  3. Refering to the lcd.h CodeVisionC library for LCD displays, explain how how the routine _lcd_ready works in terms of the LCD display hardware commands. Do this by providing an expanded comment for each line of assembler code and a paragraph explaining what the routine must do.
Copyright Cornell University Feb 2001