quiz3_fall2009_key - DELAY_5S: LDX #1000 DELAY_1: LDY...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
ECE 383 - Microcomputers Fall 2009 – Quiz 3 Solution Instructions: 1. Please write your name and student number in the upper right hand corner of the back of this sheet. 2. When you are finished answering the questions, fold the paper in half lengthwise with this side of the page to the inside of the fold. Problems: 1. What is the 7-segment LED patterns (Hexadecimal) of the following symbols a. “A” $77 b. “H” $76 c. “E” $79 d. “L” $38 e. “P” $73 f. “!” $86 2. Finish the following code for a 5s delay (assuming 24MHZ MCLK).
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: DELAY_5S: LDX #1000 DELAY_1: LDY #40000 DBNE Y, * DBNE X, DELAY_1 3. Finish the following code that can display data on the discrete LED. ORG $1000 DATA DC.B $F0 ORG $2000 MOVB #$FF , DDRB MOVB #%00000010 , DDRJ MOVB DATA , PORTB BCLR PORTJ , #%00000010 JSR DELAY_5s BSET PORTJ , #%00000010 4. Finish the following code that can test whether Key4 is pressed MOVB #$0F , DDRA BSET PORTA, #%00001111 BCLR PORTA, #%00000001 NOP BRSET PORTA, #%11110000 , * LDAA PORTA C M P A #$DE BNE KEY4_NOT_PRESSED...
View Full Document

This note was uploaded on 11/22/2011 for the course ECE 350 taught by Professor Staff during the Spring '08 term at Alabama.

Ask a homework question - tutors are online