Table of Contents
Advertisement
LH75400/01/10/11 (Preliminary) User's Guide
Glossary
RTC
Real Time Clock. The RTC provides a periodic interrupt that is referenced to real time.
Generally, the RTC is referenced to 1 second (1 Hz). The interrupt is programmable to
occur after n 1-second ticks, set in a 32-bit register. The interrupt can be used to control
other peripherals or software tasks requiring reference to real-time.
RW
In register tables: Read or Write. RW fields may be read or written.
SoC
System-on-Chip. A microprocessor and supporting peripherals on a single chip.
SSP
Synchronous Serial Port. The SSP implements a serial interface that can communicate
with external devices using the Motorola SPI interface, Texas Instruments Synchronous
™
Serial Interface, or National Semiconductor MICROWIRE
interface. The SSP performs
all serial-to-parallel and parallel-to-serial data conversions, and can work with data frames
ranging from 4 to 16 bits.
STN
Super-Twist Nematic (Grayscale) Liquid Crystal Display. Uses transmitted light to
form a display.
SWI
Software Interrupt. An SWI causes an interrupt to be asserted due to a decision within the
software, rather than in response to a hardware stimulus. SWIs can be assigned priority
within the VIC, just as hardware interrupts.
TCM
Tightly Coupled Memory. Memory that is directly connected to CPU core, bypassing the
AHB. Allows the CPU core to access this memory without AHB access overhead. The
LH75400/01/10/11 has 16KB of TCM.
UART
Universal Asynchronous Receiver and Transmitter. A UART's primary function is to pro-
vide the translation and timing necessary to convert serial data streams to parallel data
groups and vice-versa. The UARTs on the LH754xx convert the internal parallel data to an
external serial data stream, add necessary start and stop bits, generate parity if required,
and clock the serial data at a programmed baud rate.
USB
Universal Serial Bus. USB defines the hardware and protocol for a 'plug and play' serial
communications interface, which has largely replaced the once-standard serial port on
PCs and other devices. USB devices require virtually no intervention by the user one the
device is connected to the bus. USB hosts communicate with USB clients.
7/15/03
27-5
Advertisement
Table of Contents
