Am186™CC/CH/CU Microcontrollers User’s Manual
Glossary-1
GLOSSARY
A
A bus
Nonmultiplexed address bus.
ACK
Acknowledgment.
AD bus
Multiplexed address and data bus.
ADCCP
Advanced data communication control procedures.
ADSL
Asymmetrical digital subscriber line.
See
DSL.
ANSI
American national standards institute.
asynchronous
Pertaining to two or more processes that do not depend
on the occurrence of specific events such as common
timing signals.
asynchronous transmission
Data transmission in which each information character
is individually synchronized (usually by the use of start
and stop elements).
Compare to
synchronous transmis-
sion
and
isochronous transmission.
AT interface
A method of communicating with and controlling
modems. Developed by Hayes Microcomputer Prod-
ucts, the AT Command Set has become a de facto
standard most modems are designed to use.
B
bit stuffing
Adding bits to a transmitted message to round out a
fixed frame or to break up a pattern of data bits that
could be misconstrued as control codes.
Also called
zero-bit insertion.
Compare to
bit unstuffing.
bit unstuffing
Deleting bits from a received message to remove any
bits added to round out a fixed frame or to break up a
pattern of data bits that could be misconstrued as con-
trol codes.
Also called
zero-bit deletion.
Compare to
bit
stuffing.
break
During serial communications, a constant Low signal on
the receive data line for one frame time or greater. In the
Am186CC/CH/CU microcontrollers, this is reported as a
zero character with the framing error (FER) and break
(BRK) status bits set in the (H)SPSTAT register.
BRI
Basic rate interface.
buffer
(1) A routine or storage space used to compensate for
a difference in rate of data flow, or time of occurrence of
events, when transferring data from one device to
another. (2) A portion of storage space used to tempo-
rarily hold input or output data.
buffer queue
A block of memory to which data is written or from which
data is read during a DMA transfer. Software specifies
the length and base address of the buffer queue. The
DMA transfer writes data to each byte or word of the
buffer queue until it reaches the end of the transfer or
the end of the buffer queue.
Compare to
circular buffer.
buffer descriptor ring
See
descriptor ring.
bulk transfer
A nonperiodic data transmission process that typically
consists of large bursts of information. Bulk transmis-
sion is typically used for a transfer that can use any
available bandwidth and also can be delayed until band-
width is available.
byte
A group of eight adjacent binary digits (bits).
C
CCIT
International telegraph and telephone consultative
committee.
circular buffer
A block of memory to which data is written or from which
data is read during a DMA transfer. Software specifies
the length and base address of the circular buffer. The
DMA transfer writes data to or reads data from each
byte or word of the circular buffer. If the transfer reaches
the end of the buffer, the DMA control hardware points
Summary of Contents for Am186 CC
Page 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
Page 4: ...iv Am186 CC CH CU Microcontrollers User s Manual...
Page 18: ...Table of Contents xviii Am186 CC CH CU Microcontrollers User s Manual...
Page 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
Page 40: ...Architectural Overview 1 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 86: ...System Overview 3 36 Am186 CC CH CU Microcontrollers User s Manual...
Page 92: ...Emulator Support 4 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 112: ...DRAM Controller 6 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 134: ...Interrupts 7 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 186: ...Programmable I O Signals 9 8 Am186 CC CH CU Microcontrollers User s Manual...
Page 200: ...Watchdog Timer 11 6 Am186 CC CH CU Microcontrollers User s Manual...
Page 232: ...Asynchronous Serial Ports UARTs 13 24 Am186 CC CH CU Microcontrollers User s Manual...
Page 242: ...Synchronous Serial Port SSI 14 10 Am186 CC CH CU Microcontrollers User s Manual...
Page 264: ...High Level Data Link Control HDLC 15 22 Am186 CC CH CU Microcontrollers User s Manual...
Page 332: ...Universal Serial Bus USB 18 34 Am186 CC CH CU Microcontrollers User s Manual...
Page 348: ...Register Summary A 16 Am186 CC CH CU Microcontrollers User s Manual...
Page 376: ...Index Index 18 Am186 CC CH CU Microcontrollers User s Manual...