The Instruction Set of 8086 1. How many instructions are there in the instruction set of 8086? Ans. There are 117 basic instructions in the instruction set of 8086. 2. Do 8086 and 8088 have the same instruction set? Ans. Yes, both 8086 and 8088 have the same instruction set. 3. Mention the groups in […]
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Posts by Farahat
Programming Techniques
Programming Techniques 1. Write an ALP (assembly language programming) for addition of two 8-bit data BB H and 11 H. Ans. 0200 MOV AL, BB H : 8-bit data BB H into AL 0202 MOV CL, 11 H : 8-bit data 11 H into CL 0204 ADD AL, CL : Contents of AL and CL […]
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Addressing Modes of 8086
Addressing Modes of 8086 1. What is meant by addressing mode? Ans. An instruction consists of an opcode and an operand. The operand may reside in the accumulator, or in a general purpose register or in a memory location. The manner in which an operand is specified (or referred to) in an instruction is called […]
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Memory Organisation
Memory Organisation 1. Mention the address capability of 8086 and also show its memory map. Ans. 8086, via its 20-bit address bus, can address 220 = 1,048,576 or 1 MB of different memory locations. Thus the memory space of 8086 can be thought of as consisting of 1,048,576 bytes or 524,288 words. The memory map […]
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The 8086 Microprocessor
The 8086 Microprocessor 1. Draw the pin diagram of 8086. Ans. There would be two pin diagrams—one for MIN mode and the other for MAX mode of 8086, shown in Figs. 11.1 and 11.2 respectively. The pins that differ with each other in the two modes are from pin-24 to pin-31 (total 8 pins). 2. […]
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USART 8251 (Universal Synchronous/ Asynchronous Receiver Transmitter)
USART 8251 (Universal Synchronous/ Asynchronous Receiver Transmitter) 1. Draw the pin diagram of USART 8251. Ans. The pin diagram of 8251 is as shown below: 2. Draw the functional block diagram of 8251. Ans. The functional block diagram of 8251 is shown below: 3. How many different sections does 8251 have? Ans. 8251 has five […]
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IEEE:488 Bus
IEEE:488 Bus 1. What is a IEEE-488 Bus? Ans. It is a byte serial, 8-bit parallel, asynchronous type of instrument interface and was introduced by IEEE in 1975. It comes in a standard 24-pin connector. 2. What are the other names by which IEEE-488 bus is known? Ans. The other names of IEEE-488 bus are […]
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The Universal Serial Bus (USB)
The Universal Serial Bus (USB) 1. Mention the data transfer rates supported by USB. Ans. USB supports three types of data transfer rates 480 Mbps (high speed) 12 Mbps (full speed) 1.5 Mbps (low speed) 2. What are the units in a USB system? Ans. There are three units in a USB system—a USB host, […]
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BUS STANDARDS RS:232C Standard
BUS STANDARDS RS:232C Standard 1. What logic convention is followed in RS-232C and indicate the corresponding voltage levels also. Ans. A negative logic convention is used for such a standard. Logical ‘1’ is represented by a transmitted voltage level in the range of –3V to –15V, while a logical ‘0’ is represented by a transmitted […]
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Programmable DMA Controller (DMAC) 8257
Programmable DMA Controller (DMAC) 8257 1. Draw the pin diagram of8257. Ans. The following figure gives the pin connection diagram of 8257. 2. Draw the functional block diagram of8257. Ans. The following figure shows the functional block diagram of the DMAC 8257. As is apparent from the figure, it consists of eight blocks: data bus […]
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