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Within micro controller's software, it is very useful to be able to manipulate binary bits i.e. from ports etc. The ALU has command to shift data, rotate data, compare data, set/clear bits, test bits and logical operate on data.
LSLA i.e shift A one place to the left fill up with 0 LSLB i.e shift B one place to the left fill up with 0 LSRA i.e shift A one place to the right fill up with 0 LSRB i.e shift B one place to the right fill up with 0 ROLA i.e rotate A one place to the left through carry ROLB i.e rotate B one place to the left through carry RORA i.e rotate A one place to the right through carry RORB i.e rotate B one place to the right through carry CBA i.e A-B with no answer stored just flags set CMPA i.e compare A with memory i.e A-M CMPB i.e compare B with memory i.e B-M BSET $20,#$1 i.e set bit 1 of memory address 20 BCLR $20,#$1 i.e clear bit 1 of memory address 20 BITA $20 i.e Check bit mask found in A with address 20 BITB $20 i.e Check bit mask found in A with address 20 ANDA $20 i.e logical and A with data at address 20 EXORA $20 i.e logical exor A with data at address 20 COM $20 i.e logical invert data at address 20 ORRA $20 i.e logical OR A with data at address 20 MUL ;Multiplies axb and stores the answer in D i.e both FDIV ;Fractional divide using D/IX IDIV ;Integer divide using D/IX ADDD ;16 bit add to D DAA ;Decimal adjust add sum to BCD data
DMA controllers in computer system: DMA Controller Part of the I/O device interface DMA Channels Performs functions that in general would be performed by t
What is disadvantage of Distributed systems? Ans. Reliability is disadvantage of Distributed system.
Determine the term- Files File maintenance is significant. Updating of files generally involves inserting, amending and deleting data. Example: A bank would amend data
Relocatable programs? Ans. Relocatable programs can be loaded almost anywhere inside the memory.
What is MASK OPERATION The mask operation is similar to selective-clear operation except which the bits of Aare cleared only where there are corresponding 0's in register B. th
(a) Convert the following number to single precision IEEE 754 based on the procedure described in class and in the notes. Express the result in hexadecimal. Show all your work.
example pumping lemma.
What is BSS(Block Started by Symbol)? A data showing at the machine level, that has initial values when a program begins and tells about how much space the kernel assigns for t
State the SELECTIVE CLEAR - logic micro operations The selective-clear operation clears to 0 bits in register A only where there are corresponding 1's in the register B. For
Explain Telephone hand set and it's working. A standard telephone set is consisted of a transmitter, electrical network and a receiver for equalization, connected circuitry to
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