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Understanding LED Control and Delay Timing in Assembly Language Programming

This quiz focuses on practical exercises in assembly language programming, emphasizing control of LEDs attached to a microcontroller port, signal delay calculations, and memory operand addressing. Participants will interact with various instructions to determine the state of LEDs after executing commands, calculate the appropriate delay setting for a 1.2 MHz processor, and match key concepts in computer architecture, such as ALU operations and addressing modes. This engaging quiz helps solidify understanding of basic principles in embedded systems programming.

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Understanding LED Control and Delay Timing in Assembly Language Programming

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  1. Quiz 4.1 Four LEDs are attached to Port 4, bits 0 thru 3. Indicate which LEDs are ON/OFF/Undefined after each instruction to the left is executed. P4.3 P4.2 P4.1 P4.0 • mov.b #0x0f,&P4DIR • and.b #0xf0,&P4OUT • bis.b #0x09,&P4OUT • xor.b #0x0f,&P4OUT • bic.b #0x06,&P4OUT • add.b #0x03,&P4OUT

  2. Quiz 4.2 • Given a 1.2 MHz processor, what value for DELAY would result in a 1/4 second delay? ? DELAY .equ mov.w #DELAY,r12 ; 2 cycles delay1: mov.w #1000,r15 ; 2 cycles delay2: sub.w #1,r15 ; 1 cycle jne delay2 ; 2 cycles sub.w #1,r12 ; 1 cycle jne delay1 ; 2 cycles

  3. Quiz 4.3 • ALU • Clocks • Control • I/O • Memory • Peripherals • Registers • Address space • Execution speed • External devices • Fast memory • Finite State Machine • Memory mapped • Word length • Match the following terms:

  4. Quiz 4.4 • add.w tab(r10),r9 • and.w &mask,r12 • bis.b #0x08,r6 • mov.b cnt,r11 • mov.w r4,r5 • mov.w #100,r14 • sub.w @r4+,r5 • xor.b @r8,r15 • Absolute • Constant • Immediate • Indexed register • Indirect auto-increment • Indirect register • Register • Symbolic • Match the following source operand modes:

  5. Quiz 4.5 Present the destination operand of the following instruction to the ALU: add.w r4,cnt ; M[cnt] += r4 Memory CPU PC PC PC PC ADDER Registers IR 0x5480 PC 0x5480 0x0218 R4 cnt ALU

  6. Quiz 4.6 Show how to retrieve a PC-relative destination operand from memory and present to the ALU:

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