7
Semiconductor, Inc.
FEATURES
5V Operation
Full duplex asynchronous receiver and transmitter
Easily interfaces to most popular micro-
processors
Adds or deletes standard asynchronous
communication bits (start, stop, and parity) to or
from a serial data stream
Independently controlled transmitter, receiver,
line status, and data set interrupts
Programmable baud rate generator allows
division of any input clock by 1 to (2
16
-1) and
generates the internal 16 x clock
Independent receiver clock input
MODEM control functions (CTS, RTS, DSR,
DTR, RI,and DCD)
Fully programmable serial interface
characteristics:
- 5, 6, 7, or 8 bit characters
- Even, odd, or no-parity bit generation and
detection
- 1, 1.5, or 2 stop bit generation
- Baud generation (DC to 56k baud)
False start bit detection
Complete status reporting capabilities
Ei16C550
FIFO UART
PIN CONFIGURATION
Tri-StateTTL drive capabilities for bi-
directional data bus and control bus
Line break generation and detection
Internal diagnostic capabilities:
- Loopback controls for communications link fault
isolation
- Break, parity overrun, and framing error simulation
Fully prioritized interrupt systems controls
16 byte FIFO for reduced CPU overhead
DESCRIPTION
The Epic Ei16C550 Universal Asynchronous Receiver
Transmitter (UART) is a CMOS-VLSI communication
device in a single package.
The UART performs serial to parallel conversion on
data characters received from a peripheral device or a
MODEM, and parallel-to-serial conversions on data charac-
ters received from the CPU. The CPU can read the complete
status of the UART at any time during the functional operation.
Status information reported includes the type and condition of
the transfer operation being performed by the UART, as well
as any error conditions (party, overrun, framing, or break
detect).
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
E
i
1
6
C
5
5
0
D0
D1
D2
D3
D4
D5
D6
D7
RCLK
SIN
SOUT
CS0
CS1
CS2
BAUDOUT
XTAL1
XTAL2
DOSTR
VSS
VCC
RI
DCD
DSR
CTS
MR
OUT1
DTR
RTS
OUT2
INTRPT
RXRDY
A0
A1
A2
ADS
TXRDY
DDIS
DISTR
DISTR
39
38
37
36
35
34
33
32
31
30
29
7
8
9
10
11
12
13
14
15
16
17
D5
D6
D7
RCLK
SIN
NC
SOUT
CS0
CS1
CS2
BAUD-
OUT
MR
OUT1
DTR
RTS
OUT2
NC
INTRPT
RXRDY
A0
A1
A2
XT
AL1
XT
AL2
DOSTR
DOSTR
VSS
NC
DISTR
DISTR
DDIS
TXRDY
ADS
D4
D3
D2
D1
D0
NC
VCC
RI
DCD
DSR
CTS
18
19
20
21
22
23
24
25
26
27
28
6
5
4
3
2
1
44
43
42
41
40
Ei16C550
40-PIN DIP
44-PIN PLCC
36 N.C.
35 RESET
34 OP1
33 DTR
32 RTS
31 OP2
30 INT
29 RXRDY
28 A0
27 A1
26 A2
25 N.C.
N.C. 1
D5 2
D6 3
D7 4
RCLK 5
N.C. 6
RX 7
TX 8
CS0 9
CS1 10
CS2
11
BAUDOUT
12
48 N.C.
47 D4
46 D3
45 D2
44 D1
43 D0
42 VCC
41 RI
40 CD
39 DSR
38 CTS
37 N.C.
N.C. 13
XT
AL1 14
XT
AL2 15
-IOW 16
IOW 17
GND 18
IOR
19
IOR 20
N.C. 21
DDIS
22
TXRDY
23
AS 24
48-PIN TQFP
Ei16C550
Part Numbers May Be Marked With "IMP" or "Ei."
For additional information, contact IMP, Inc. at 408.432.9100 or visit www.impweb.com
IMP, Inc. acquired Epic products on January 26, 2001. (see press release at http://www.impweb.com/PRESS/PR012601.htm)
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