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.
This is an applied unit that shows you how to assess interactive products against a selection of usability and user experience goals. It also introduces a selection of design princ
what is the significance of telecommunications deregulation for managers and organization
Dialog-task updates are Synchronous updates.
Sort the following list using selection sort technique, displaying each step. 20,12,25,6,10,15,13
How does TCP/IP decide the size of an IP fragment? Explain. TCP/IP protocol utilizes the name IP datagram to refer to an Internet packet. The amount of data carried into a data
Q. Write an interrupt routine to handle 'division by zero'? This file can be loaded just like a COM file though makes itself permanently resident until the system is running.
how to calculate students''s averange test scores
state function and path function
Version Control is a critical tool in development and production environments that allows a user to make snapshots of working con?gurations or code. In this assignment, you will de
Q. Describe THEAD, TBODY and TFOOT tag? THEAD, TBODY, TFOOT , , and form groups of rows. specifies that a group of rows are heade
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