Glossary
Glossary-4
Am186™CC/CH/CU Microcontrollers User’s Manual
G
GCI
General circuit interface, also called IOM-2. One of the
external interfaces supported by the Am186CC commu-
nications controller HDLC channels. GCI is an interface
specification developed jointly by Alcatel, Italtel, GPT,
and Siemens. This specification defines an industry
standard serial bus for interconnecting telecommunica-
tions integrated circuits. The standard covers linecard,
NT1, and terminal architectures for Integrated Services
Digital Network (ISDN) applications. The Am186CC
communications controller supports the terminal ver-
sion of GCI. GCI on the Am186CC communications
controller supports polled and interrupt modes, but does
not support DMA mode.
See
IOM-2.
general-purpose DMA
The term used to describe standard or typical DMA pro-
cessing as opposed to DMA processing using the
SmartDMA channels in the Am186CC/CH/CU micro-
controllers.
See also
DMA
and
SmartDMA.
H
half duplex
The ability of a serial communications connection to
transmit data in both directions, but not at the same
time.
Compare to
full duplex.
hardware interrupt
Any one of the maskable interrupts, or an NMI or watch-
dog timer interrupt. When a hardware interrupt is
generated, the IF flag is cleared unless in polled mode.
Compare to
software interrupt.
HDLC
High-level data link control. A very common bit-oriented
data link protocol (OSI layer 2) issued by ISO. Similar
protocols are ADCCP, LAP-B, and SDLC. The
Am186CC communications controller provides four
HDLC channels. The HDLC channels support full-
duplex transfers in polled, interrupt, and DMA modes.
HOLD latency
The time between a HOLD request and the HOLD
acknowledge.
host
The host computer system where the USB host control-
ler is installed. This includes the host hardware platform
(CPU, bus, etc.) and the operating system in use.
I
ICE
In-circuit emulator. A device for testing and program-
ming an integrated circuit outside of any actual system
in which the device will be used.
internal peripherals
Components on a microcontroller integrated circuit
other than the embedded CPU that provide control over
some specific function. On the Am186CC/CH/CU
microcontrollers, internal peripherals would include but
not be limited to the HDLC controller, the DMA control-
ler, the USB peripheral controller, and the DRAM
controller. For lists of the internal peripherals in the
Am186CC/CH/CU microcontrollers, see “Features” on
page 1-1.
internal reset
The reset of the Am186CC communications controller
initiated by the watchdog timer.
Compare to
external
reset
and
system reset.
interrupt
A command or signal that tells the processor to stop
what it is doing and wait for further instruction. The inter-
rupt may require the processor to suspend its current
job and perform another function that is more pressing.
interrupt channel
The group of logic that is comprised of a control register,
an in-service bit, a request bit, and a mask bit. The inter-
rupt channel controls the behavior of a maskable
interrupt.
interrupt endpoint
A USB endpoint used for small data transfers that in the
past have been interrupt-driven. The interrupt endpoint
is polled at a regular programmable interval to allow the
device to transfer interrupt data such as event notifica-
tion, keyboard characters, and pointing device
coordinates to the host.
Compare to
control endpoint
and
data endpoint
.
interrupt latency
The time period between an interrupt request and the
servicing of the interrupt.
See also
latency
,
DMA
latency,
and
HOLD latency
.
interrupt mode
One of three modes supported by the Am186CC com-
munications controller for serial communications. In
interrupt mode, software performs other tasks until an
interrupt tells it to service a serial channel.
Compare to
DMA mode
and
polled mode
.
interrupt source
Any source (internal or external) that can request an
interrupt. This can be a physical pin, or an on-chip
peripheral.
Содержание Am186 CC
Страница 1: ...Am186 CC CH CU Microcontrollers User s Manual Order 21914B...
Страница 4: ...iv Am186 CC CH CU Microcontrollers User s Manual...
Страница 18: ...Table of Contents xviii Am186 CC CH CU Microcontrollers User s Manual...
Страница 24: ...Introduction xxiv Am186 CC CH CU Microcontrollers User s Manual...
Страница 39: ...Architectural Overview Am186 CC CH CU Microcontrollers User s Manual 1 15 Figure 1 6 32 Channel Linecard CH CC...
Страница 40: ...Architectural Overview 1 16 Am186 CC CH CU Microcontrollers User s Manual...
Страница 86: ...System Overview 3 36 Am186 CC CH CU Microcontrollers User s Manual...
Страница 92: ...Emulator Support 4 6 Am186 CC CH CU Microcontrollers User s Manual...
Страница 112: ...DRAM Controller 6 8 Am186 CC CH CU Microcontrollers User s Manual...
Страница 134: ...Interrupts 7 22 Am186 CC CH CU Microcontrollers User s Manual...
Страница 186: ...Programmable I O Signals 9 8 Am186 CC CH CU Microcontrollers User s Manual...
Страница 200: ...Watchdog Timer 11 6 Am186 CC CH CU Microcontrollers User s Manual...
Страница 232: ...Asynchronous Serial Ports UARTs 13 24 Am186 CC CH CU Microcontrollers User s Manual...
Страница 242: ...Synchronous Serial Port SSI 14 10 Am186 CC CH CU Microcontrollers User s Manual...
Страница 264: ...High Level Data Link Control HDLC 15 22 Am186 CC CH CU Microcontrollers User s Manual...
Страница 332: ...Universal Serial Bus USB 18 34 Am186 CC CH CU Microcontrollers User s Manual...
Страница 348: ...Register Summary A 16 Am186 CC CH CU Microcontrollers User s Manual...
Страница 376: ...Index Index 18 Am186 CC CH CU Microcontrollers User s Manual...