H8250 Datasheet, PDF (1/7 Pages) List of Unclassifed Manufacturers – Universal Asynchronous Receiver/Transmitter

H8250 Megafunction
Universal Asynchronous
Receiver/Transmitter
General Description
The H8250 is a standard UART providing 100%
software compatibility with the popular Intel 8250
device. It performs serial-to-parallel conversion on
data originating from modems or other serial
devices, and performs parallel-to-serial
conversion on data from a CPU to these devices.
Developed for easy reuse in Altera FPGA
applications, the H8250 is available optimized for
several device families with competitive utilization
and performance characteristics.
Symbol
A(2:0)
CS
RD
WR
MR
CLK
DIN(7:0)
RCLK
SIN
CTSn
DSRn
DCDn
RIn
DOUT(7:0)
SOUT
DDIS
RTSn
DTRn
OUT1n
OUT2n
INTR
BOUDOUTn
RXRDY
TXRDY
H8250
Features
• ^{Capable of running all existing 8250 software}
• ^{Adds or deletes standard asynchronous}
communication bits (start, stop and parity) to
or from the serial data
• ^{Independently controlled transmit, receive,}
line status and data set interrupts
• ^{Programmable baud generator divides any}
input clock by 1 to (2¹⁶ - 1) and generates the
16 x clock
• ^{Independent receiver clock input}
• ^{Modem control functions (CTSn, RTSn, DSRn,}
DTRn, RIn, and DCDn)
• ^{Fully programmable serial interface}
characteristics:
o 5, 6, 7, or 8 bit characters
o Even, odd, or no-parity bit generation and
detection
o 1, 1½, or 2 stop bit generation
o Baud generation
• ^{False start bit detection}
• ^{Complete status register}
• ^{Internal diagnostic capabilities: loopback}
controls for communications link fault isolation
• ^{Full prioritized interrupt system controls}
Applications
• ^{Serial or modem computer interface}
• ^{Serial interface within modems and other devices}
CAST, Inc.
June 2002
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