July 2008
Intermediate to advanced
544 pages
16h 52m
English
Content preview from Computers as Components, 2nd Edition
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280 CHAPTER 5 Program Design and Analysis
Time
Start bit Bit
Sampling interval
FIGURE 5.33
Receiving bits in the modem.
Name Modem.
Purpose A fixed baud rate frequency-shift keyed modem.
Inputs Analog sound input, reset button.
Outputs Analog sound output, LED bit display.
Functions Transmitter: Sends data stored in microprocessor
memory in 8-bit bytes. Sends start bit for each byte
equal in length to one bit.
Receiver: Automatically detects bytes and stores
results in main memory. Displays currently received
bit on LED.
Performance 1200 baud.
Manufacturing cost Dominated by microprocessor and analog I/O.
Power Powered by AC through a standard power supply.
Physical ...