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!
Configure port A for the lower 4 bits to be inputs and the upper 4 bits to be outputs. The program should chase a logic one from Pa4 -> Pa7, depending upon the condition of Pa0-Pa3 the speed of chase is increased.
Pa0 = 1 Slow Counter Pa1 = 1 Counter Pa2 = 1 Counter Pa3 = 1 Fast Counter If all Pa0, Pa1, Pa2, Pa3 = 0 wait The only major difference is the data direction i.e. this configures 4 input lines Pa0-Pa3 and 4 output lines Pa4-Pa7
Paddr Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 1 1 1 1 0 0 0 0 The full program is shown below
name first padr equ $0000 paddr equ $0001 org $500 ldaa #$f0 staa paddr set up half in and half out loop0 ldaa #$10 staa padr send data jsr delay ldaa #$20 staa padr send data jsr delay ldaa #$40 staa padr send data jsr delay ldaa #$80 staa padr send data jsr delay jmp loop0 delay ldab padr ;get input from port a andb #$0f ;mask of lower nibble only
beq delay ;repeat till selected ldab padr ;get port a data again andb #$8 ; mask off bit 3 pa3 bne loop3 ;if select go to loop3 ldab padr ;get port a data again andb #$4 ; mask off bit 2 pa2 bne loop4 ;if select go to loop4 ldab padr ;get port a data again andb #$2 ; mask off bit 1 pa1 bne loop5 ;if select go to loop5 ldx #$ffff ;assume pa0 is pressed load up x with ffff jmp loop1 ;carry on loop2 ldx #$1 ;load up X with 1 fast jmp loop1 ;carry on loop3 ldx #$f ;load X with f jmp loop1 loop4 ldx #$ff ;load x with ff jmp loop1 loop5 ldx #$fff ;load x with fff slow loop1 ldab #$1f ;nested loop loop6 decb bne loop6 dex bne loop1 ;loop till zero rts ;return back to main end
Question 1: Spreadsheet packages are widely used in Business. a) Explain why spreadsheets are so useful. b) Spreadsheet files are sometimes saved for use by other software p
Why a computer expect to receive responses when it broadcast an ARP request? Response will be acquired only from the machine for that request is being sent not for the other ma
Does it makes sense for two domain name servers to contain exactly the same set of names? Why? Yes. This is very advantageous for two domain servers having similar set of names
What is DRAM? What do you understand by DRAM refreshing? With the help of a block diagram, demonstrate how DRAM can be interfaced to a microprocessor. Dynamic RAM (DRAM) is bas
what are the steps to implement bus topology?
tCAS is the number of clock cycles required to access a particular column of data in SDRAM. CAS latency is the column address strobe time, sometimes referred to as tCL.
Data buffering is quite helpful for purpose of smoothing out gaps in speed of processor and I/O devices. Data buffers are registers that hold I/O information temporarily. I/O is pe
What logic is inferred when there are multiple assign statements targeting the same wire? It's illegal to specify multiple assign statements to the same wire in a synthesizable
List the major components of the keyboard/Display interface. a. Keyboard section b. CPU interface section c. Display section d. Scan section
The next major set of tasks to tackle are delete and update. Version control systems typically version updates to a ?le and only store the differences between the ?les. Two system
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