Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Let us review the operation of the stack within the 68HC11, the stack is a defined area of RAM which is last in first out register (LIFO) . Access to the stack is made via a stack pointer (SP). In the 68HC11 there is only one stack pointer and it is initialised by the LDS command. To transfer data onto the stack we can use the command PSHA or PSHB i.e. push register A or B onto the stack. To remove data simply pull it i.e PULA or PULB, likewise the index registers may be stacked etc.
PSHA Push A onto Stack PSHB Push B onto Stack PSHX Push X onto Stack PSHY Push Y onto Stack PULA Pull A onto Stack PULB Pull B onto Stack PULX Pull X onto Stack PULY Pull Y onto Stack
Every time data is 'Pushed' onto the stack the Stack pointer is decrements accordingly. The stack is used often by the micro controller for temporary holding data, if a subroutine occurs, the processor stacks the return address and upon the receipt of the RTS command, it pulls the return address automatically. During an interrupt the processor stacks the full details of itself i.e.
SP Condition code SP-1 Accumulator A SP-2 Accumulator B SP-3 Index register X high SP-4 Index register X low SP-5 Index register Y high SP-6 Index register Y low SP-7 return address High SP-8 Return address Low SP-9 Stack pointer after interrupt
Therefore great care should be taken when using the stack as during an interrupt or subroutine if you place data on the stack you must remove the data before you return from it.
Q. Illustrate Header section of a device driver? Header comprises information which allows DOS to identify the driver. It also comprises pointers which allow it to chain to ot
Determine the Example - "fork-join" module initial_fork_join(); reg clk,reset,enable,data; initial begin $monitor("‰g clk=‰b reset=‰b enable=‰b data=‰b", $time, cl
Q. Why we use Modem? A Modem is one device which most computer users who have surfed Internet are aware of. A modem is neededsincehowever most of telecommunications have becom
What are the major functions of IO system? i. Interface to the CPU and memory by the system bus. ii. Interface to one or more IO devices by tailored data link.
Q. What is Shadow Mask? Shadow Mask is a metal sheet that has fine perforations (holes) in it and is situated a short distance before phosphor coated screen. The Phosphor dots
Define Electronic Data Interchange. An EDI stand for Electronic Data Interchange is used by organizations for transactions which occur on regular basis to a pre-determined for
Explain the role that XML can play when dynamically generating HTML pages from a relational database? Ans) Even if student has never participated in a project involving this typ
Analysis which determines the meaning of a statement once its grammatical structure becomes known is termed as? Ans. The meaning of a statement when its grammatical structure b
In a pure combinational circuit is it necessary to mention all the inputs in sensitivity disk? if yes, why? Yes in a pure combinational circuit is it essential to mention all
decode the code
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd