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PROGRAM: BCA (REVISED 2007)
SEMESTER: 3RD SEM
SUBJECT CODE & NAME: DESIGN: BC0046 – MICROPROCESSOR
CREDIT: 4
BK ID: B0807
MAX. MARKS: 60
Q.1: Explain about different status flags of 8080 and 8085 microprocessor
ANS:
The Status Flags of the 8080 and 8085 are single bits which indicate the logical conditions that existed as a result of the execution of the instruction just completed. This allows instructions following to act accordingly, such as a branch as a result of two values comparing equal. The flags are:
Q.2: Discuss about any 5 addressing modes of 8086 microprocessor?
ANS:
The addressing modes for the 8086 instructions are:
Immediate-The datum is either 8 bits or 16 bits long and is part of theInstruction
Q.3: Discuss Block Transfers and DMA?
ANS:
If the data transfer rate to or from an I/O device is relatively low, then the communication can be performed using either programmed or interrupt I/O. Some devices, such as magnetic tape and disk units and analog to-digital converters, may operate at data rates that are too high to be handled bybyte or word transfers. Data rates for I/O and mass storage devices are often determined by the devices, not the CPU,
Q.4: Define i)Conditional Branch Instructions ii) Unconditional Branch Instructions
ANS:
Conditional Branch Instructions:
All conditional branch instructions have the following 2-byte machine code format:
Op Code D8
where the second byte gives an 8-bit signed (2's complement) displacement relative to the address of the
Q.5: Explain about minimum mode in 8086 configurations
ANS:
A processor is in minimum mode when itsMN /MX pin is strapped to +5 V. The definitions for pin: 24 through 31 for the minimum mode. The address must be latched since it is available only during the first
Q.6: Write about NDP’s data types in 8087 microprocessor.
ANS:
The 8087 can operate on memory operands of seven different data types: word integer, short integer, long integer, packed BCD, short real, long real, and temporary real. The number of bytes, format, and approximate range for each of the data types. In memory, the least significant byte of a number is always stored in the lowest address. The 8086 can operate on integers of only 16 bits, with a range from -215to
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