Strathmore

UNIVERSITY

SCHOOL OF COMPUTING AND ENGINEERING SCIENCES

BACHELOR OF SCIENCE IN INFORMATICS AND COMPUTER SCIENCE

ICS $3111$: MICROPROCESSORS

CONTINUOUS ASSESSMENT TEST I

Date: ${26}^{th}$ May $2023$

Time: $1HR$

A set of memory units are listed below, determine the number of registers available per unit and the minimum number of address lines applicable to each unit.

a$.2K4=2048$

$1mk$

b$.4K8=$

c$.1M44026,12$

$1mk$

d$.2M8$

$=1048526=20$

$1mk$

$1mk$

Briefly explain the function of the following Intel $8085$ components

a$.$ Instruction decoder $-$ Intepuets instmithes and concest into costar synd

b$.$ Program counter $-$ Tarks th exculor of pogram $2mks$

As a computer engineer you are allocated a $324$ memory units. Your company wants to embed to a home appliance a $9616$ memory block. Design this configuration showing the number of address and data lines presentable for mass production.

$4$marks

What is the function of the following Intel $8085$ control signals

a$.$ ALE

$2mks$

b$.\frac{10}{\frac{?}{?}}$bar $(M)$

$2mks$

How will the Intel $8085$ microprocessor behave if the following

a$.$ After consecutive register updates, the register contents becomes zero

$1mk$

b$.$ There is a carry from bit $3$ to bit $4$ of the accumulator $1mk$&$C=1$

c$.$ Every time an opcode is executed

$1mkPC=PC+$

d$.$ The stack pointer is initialized to $7$FFFH and the PUSH command is executed

$1mk$

$p=5p-1$