July 2008
Intermediate to advanced
544 pages
16h 52m
English
Content preview from Computers as Components, 2nd Edition
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34 CHAPTER 1 Embedded Computing
In this regular expression:
■ P is the preamble, which is a sequence of at least 10 1 bits. The command
station should send at least 14 of these 1 bits,some of which may be corrupted
during transmission.
■ S is the packet start bit. It is a 0 bit.
■ A is an address data byte that gives the address of the unit, with the most
significant bit of the address transmitted first. An address is eight bits long.
The addresses 00000000, 11111110, and 11111111 are reserved.
■ s is the data byte start bit, which, like the packet start bit, is a 0.
■ D is the data byte, which includes eight bits. A data byte may contain an
address, instr ...
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