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a) An interfacing diagram of 8251A with 8086 system is shown below. An important block is hidden in the diagram which helps the 8251A interconnection with RS-232 cable. What is the name of that hidden block which is unlabeled in diagram and what is the role of that block in serial communication?

a) An interfacing diagram of 8251A with 8086 system is shown below. An important block is hidden in the diagram which helps the 8251A interconnection with RS-232 cable. What is the name of that hidden block which is unlabeled in diagram and what is the role of that block in serial communication?

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Q 1. a) An interfacing diagram of 8251A with 8086 system is shown below. An important block is hidden in the diagram which helps the 8251A interconnection with RS-232 cable. What is the name of that hidden block which is unlabeled in diagram and what is the role of that block in serial communication? D.-D, Latches and Buffers A, - A, 8086 CPU Bus A, D, - D, M/TO WR RD CĪD DSR TTL Serial Bus TxD RD WR RD RxD RTS CTS WR А, 8251A 1OCS -0 IOCS -1 1OCS - 2 А, DTR RXRDY TXRDY 8284 A. Clock 1OCS - 3 A, Generator TXEMPTY ??? IOCS-4 IOCS - 5 SYNDET/ BRKDET M/ĪO IOCS-6 IOCS - 7 PCLK +5-V G, RS-232 Serial Bus Clock Divider Clock Divider 9-pin D-type Connector CLK READY RESET く 3-to-8 Decoder RESET D, - D, TxD
Transcribed Image Text:Q 1. a) An interfacing diagram of 8251A with 8086 system is shown below. An important block is hidden in the diagram which helps the 8251A interconnection with RS-232 cable. What is the name of that hidden block which is unlabeled in diagram and what is the role of that block in serial communication? D.-D, Latches and Buffers A, - A, 8086 CPU Bus A, D, - D, M/TO WR RD CĪD DSR TTL Serial Bus TxD RD WR RD RxD RTS CTS WR А, 8251A 1OCS -0 IOCS -1 1OCS - 2 А, DTR RXRDY TXRDY 8284 A. Clock 1OCS - 3 A, Generator TXEMPTY ??? IOCS-4 IOCS - 5 SYNDET/ BRKDET M/ĪO IOCS-6 IOCS - 7 PCLK +5-V G, RS-232 Serial Bus Clock Divider Clock Divider 9-pin D-type Connector CLK READY RESET く 3-to-8 Decoder RESET D, - D, TxD
b) Observe the timing diagrams given in Fig. A and Fig. B below and identify the mode of operation when these kind of waveforms are produced on the OUT pin of the IC. Also, name the IC and explain the mode during which the following output waveforms were produced. Number of Clock Write Control Word Write Count Value (03H) Pulses WR 5: 6 :8: 9; 10 CLK GATE- OUT xx 03 02 01 03 02 0T 03 02 :0I: 03 Count Value Count Reloaded Count Reloaded Count Reloaded Loaded Count after Each Value Clock Pulse Fig. A Number of Clock Pulses Write Control Word Write Count Value (06H) WR- 34s 6 7 89 10 11 12 13 CLK GATE Count Value after Each OUT. Clock Pulse xx xx Xx xx 06 04 o2 06 04 02 06 04 02 06 04 02 06 Loaded Count Count Reloaded Count Reloaded Count Count Value Reloaded Reloaded Fig. B c) Write a program in 8051 to copy the contents of registers R0 to R7 into internal RAM addresses 40H to 47H respectively using PUSH instructions. Assume Register Bank 0 is selected. d) Design a Programmable timer using 8254 and 8086 to generate a square wave of period 5 millisecond. Interface 8254 at the address 0040H for Counter 0 and write the assembly language program. The 8086 and 8254 runs at 6 megahertz and 3 megahertz respectively.
Transcribed Image Text:b) Observe the timing diagrams given in Fig. A and Fig. B below and identify the mode of operation when these kind of waveforms are produced on the OUT pin of the IC. Also, name the IC and explain the mode during which the following output waveforms were produced. Number of Clock Write Control Word Write Count Value (03H) Pulses WR 5: 6 :8: 9; 10 CLK GATE- OUT xx 03 02 01 03 02 0T 03 02 :0I: 03 Count Value Count Reloaded Count Reloaded Count Reloaded Loaded Count after Each Value Clock Pulse Fig. A Number of Clock Pulses Write Control Word Write Count Value (06H) WR- 34s 6 7 89 10 11 12 13 CLK GATE Count Value after Each OUT. Clock Pulse xx xx Xx xx 06 04 o2 06 04 02 06 04 02 06 04 02 06 Loaded Count Count Reloaded Count Reloaded Count Count Value Reloaded Reloaded Fig. B c) Write a program in 8051 to copy the contents of registers R0 to R7 into internal RAM addresses 40H to 47H respectively using PUSH instructions. Assume Register Bank 0 is selected. d) Design a Programmable timer using 8254 and 8086 to generate a square wave of period 5 millisecond. Interface 8254 at the address 0040H for Counter 0 and write the assembly language program. The 8086 and 8254 runs at 6 megahertz and 3 megahertz respectively.
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