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.
Representation scheme in artificial intelligence: It is not hard to see why logic has been popular representation scheme in AI: In this way, It is easy to represent knowl
Q. Explain working of Supercomputer? Supercomputers, capable of executing in excess of one billion floating-point operations per second (FLOPS), are very powerful, extremely hi
Explain about the term E-brokerage briefly. An e-brokerage is an investment house which allows you to buy and sell stocks and acquire investment information through its Web sit
Q. What is the draw back of Access-3 Code? Give suggestion to over come this drawback.
OBJECT MODELING NOTATIONS: BASIC Concepts A system is the collection of subsystems which organised to accomplish a purpose and described by a set of models from variou
Stack overflow causes (A) Hardware interrupt. (B) External interrupt. (C) Internal interrupt. (D) Software interrupt. Stack overflow occurs whereas execution
Q. What is Memory Interleaving? In this scheme main memory is splitted in 'n' equal-size modules and CPU has separate Memory Base register and Memory Address Register for every
A field containing currency amounts (data type CURR) must be assigned to a reference table and a reference field. Explain. As a reference table, a system having all the valid
I''m suppose to create a function called calc_rectang_area(height, width),that takes two parameters: the height and width of the rectangular and return the area of the rectangular.
What is the logical difference among Move A TO B and COMPUTE B = A ? Ans) In case of Move A TO B it will move whatever the value of a in to b. It mean it will move nume
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