Online College Courses for Credit

ECET 340 Week 3 HomeWork 3

ECET 340 Week 3 HomeWork 3

Author: Irene A. Roseberry Roseberry

ECET 340 Week 3 HomeWork 3

Purchase here

Product Description

1. Sketch a circuit that can be used to debounce a pushbutton and explain how it works. (4 points max)

2. In Figure 7.32 on page 339 of the Huang textbook, if the row has and the columns are , which key is pressed? (2 points max)

3. In Figure 7.32 on page 339 of the Huang textbook, explain why the 10kΩ resistors ties to VCC are required. (2 points max)

4. Write down the lines of C code (interrupt service routine, ISR) that generates an interrupt when Port H pin 0 becomes a logic “1”. Within this ISR, disable interrupts, clear the interrupt flag, then enable interrupts, and return from routine. I also want the routine or lines of C code that initialize Port H pin 0 to be used as an interrupt (hint: think data direction register) (2 points max)

5. Write down the C statements you would need to add to the main program of the keypad driver program given in lecture and lab in order to store the key characters to a buffer area of memory called keys_entered and exit the program as soon as either seven keypresses are entered or the the “D” key is entered. (Counts as two questions) (4 points max….you need to use arrays in C code)

6. State the functions of pins RS, E and R/W in the LCD. (4 points max)

7. Give the state of RS, E and R/W~, and the command code (in hex) for the 20th location, line 2 on the 40x2 LCD described in lecture. (2 points max)

See More
Fast, Free College Credit

Developing Effective Teams

Let's Ride
*No strings attached. This college course is 100% free and is worth 1 semester credit.

37 Sophia partners guarantee credit transfer.

299 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 32 of Sophia’s online courses. Many different colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.