GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-1V (NEW) EXAMINATION - WINTER 2018
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Subject Code: 2140304 Date: 28/11/2018
Subject Name: Microprocessor & its Interfacing
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Explain R/2R ladder network circuit used in D/A converter. 03
(b) What are interfacing logic devices? Explain all with figures. 04
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(c) With neat schematic explain architecture of 8085. Why 8085 is called 8-bit microprocessor? 07
Q.2 (a) Explain various addressing modes of 8085. 03
(b) Design a seven segment LED output port with the device address F5H, using a 74LS138 3-to-8 decoder, a 74LS20 4-input NAND gate, a 74LS02 NOR gate and a common anode seven segment LED. 04
(c) Interface 32K EPROM and 32K RAM with 8085, mention the address range for both. Draw neat schematic. 07
OR
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(c) With neat schematic show interfacing circuit of D/A convertor (preferably 1408) with 8085, with necessary addressing scheme. 07
Q.3 (a) Sixteen bytes of data are stored at location CO00H to COSFH. Write a program to transfer the entire block to new location starting at DOOOH. 03
(b) Draw and explain timing diagram of STA C000h stored at memory location starting at DOOOH. 04
(c) Write a program to count continuously in hexadecimal from FFH to 00H in a system with a 0.5uS clock period. Display the number on any output port. 07
OR
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Q.3 (a) Write difference between Memory mapped I/O and Peripheral mapped I/O. 03
(b) Draw and explain timing diagram of MVI A,64H stored at memory location starting 3000H. 04
(c) Write a program to generate rectangular wave with period of 200 uS ON- period and 400 uS OFF- period. 07
Q.4 (a) Explain concept of Successive Approximation (SAR type) A to D converter with figures. 03
(b) Explain the concept if Interrupt in 8085. How many Interrupts are there in 8085? What is vector location and how it is mapped? 04
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(c) Explain various modes used in 8255 PPL 07
OR
Q.4 (a) Explain CMP and CPI instructions. 03
(b) Explain RS 232 serial communication protocol with figure. 04
(c) With neat schematic explain working of 8255 Programmable Peripheral Interface. How it is useful for 8085? 07
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Q.5 (a) Explain with figure rotate and SWAP instructions. 03
(b) Explain the concept of subroutine with help of CALL and RET instruction. 04
Interface.
OR
Q.5 (a) Explain Control word of 8155 Multipurpose programmable device. 03
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(b) Explain Bus organization of 8085. 04
(c) With neat schematic explain working of 8259 Programmable Interrupt Controller. 07
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