Answered: Below is a small assembly language…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Below is a small assembly language program.

ORG 1000H
MOV TMOD, #01D
HERE: MOV TL0, #FFH
MOV TH0, #10H
CPL P1.0
ACALL DELAY
SJMP HERE
DELAY:
SETB TR0
1LOOP: JNB TF0, 1LOOP
CLR TR0
CLR TF0
RETI
END

i) The program has four errors. Identify and state how you would correct them.
ii) Briefly describe the behaviour of the program paying particular attention to the
configuration and operation of Timer 0.
iii) Assuming the amended code is run on a classic 8051 using a 12 MHz crystal,
estimate the period of the waveform on P1.0.

1000H
MOV
HERE: MOV
MOV
CPL
ORG
DELAY:
SETB
1LOOP: JNB
CLR
CLR
RETI
END
TMOD, #01D
TLO,
# FFH
THO,
# 10H
P1.0
ACALL DELAY
SJMP HERE
TRO
TF0, 1LOOP
TRO
TFO

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