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.
What is Parsing? Parsing: It is the process of analyzing a text, made of an order of tokens, to find out its grammatical structure regarding a given formal grammar. Parsing
Explain Client Server Model. In the client- server model, communication usually takes the form of a request message from the client to the server asking for several works to be
what would be the occupancy of each leaf node of a B+ tree
Q. Show the Transmission Control Protocol? Transmission Control Protocol (TCP) TCP makes Internet reliable. TCP solves many problems which can occur in a packet switching
Q. Explain about Semiconductor Memories? Originally IC technology was used for constructing processor however soon it was realized that same technology can be used for construc
A staircase light is controlled by two switches one at the top of the stairs and another at the bottom of stairs a. Make a truth table for this system. b. Write the lo
Define about Abstraction- object oriented systems Abstraction is one of the most important ideas of object oriented systems Abstraction focus on the necessary, inherent aspec
What is a spanning Tree? A spanning tree is a tree associated with a network. All the nodes of the graph appear on the tree once. A minimum spanning tree is a spanning tree
Hazards of pipeline - computer architecture: Hazards : When a programmer (or compiler) writes assembly program code, they make the supposition that each instruction is execut
Explain advantages and disadvantages of a active document. The advantage of an active document over a dynamic document lies in its capability to update the information contin
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