Microproceesor Based Systems

Topics: PCI Express, Serial port, Serial communication Pages: 2 (439 words) Published: February 28, 2013
Which of the following baud rates are supported by the BIOS of 486/Pentium PCs? (a) 4800
(b) 3600
(c) 9600
(d) 1800
(e) 1200
(f) 19200
What is the role played by Timer 1 in serial communication?
Which mode of the timer is used for baud rated programming?
What is the role of the SBUP register in serial data transfer?

What is the function of the SUBF register?
What is the role of the SCON register in serial data transfer? Q35
Which are the important functions specified in the SOCN register? Q36
For XTAL = 11.0592 MHz, find the TH1 value (in both decimal and hex) for each of the following baud rates. (a) 9600-3
(b) 4800-6
(c) 1200-24
(d) 300-96
(e) 150-192
Write an 8051 program to transfer serially the letter “Z” continuously at a 1200 baud rate. Q39
Write an 8051 program to transfer serially the message “The earth is but one country and mankind its citizens” continuously at a 57600 baud rate. Q40
Under what conditions are the TI and RI bits raised?
Write a program to transfer the numbers 1 to 9 serially.
To which register do RI and TI belong? Is that register bit-addressable? Q43
What is indicated by the REN bit of the SCON register?
In a given situation we cannot accept reception of any serial data. How do you block such a reception with a single instruction? Q45
To which register does the SMOD bit belong? State its role in the rate of data transfer. Q46
Is the SMOD bit high or low when the 8051 is powered up?
In the following questions the baud rates are not compatible with the COM ports of the PC (X86 IBM/ compatible). Q47
Find the baud rate for the following if XTAL = 16MHz and SMOD=0 (a) MOV TH1,#-10
(b) MOV TH1,#-25
(c) MOV TH1,#-200
(d) MOV TH1,#-180
For a XTAL of frequency 22MHz, what is the baud rate if TH1 is loaded with -10? Q49
(a) MOV TH1,#-10
(b) MOV TH1,#-25
(c) MOV TH1,#-200
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