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EI82C684 Datasheet Preview

EI82C684 Datasheet

QUAD UART

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EI82C684 pdf
Semiconductor, Inc.
Part Numbers May Be Marked With "IMP" or "Ei."
Ei82C684
Ei68C684
QUAD UART
FEATURES
• Full duplex, four channel asynchronous
receiver and transmitter
• Quadruple-buffered receiver and transmitter
• Internal bit rate generator with 23 industry
standard bit rates operating from either of
two standard crystal clocks
• Independent bit rate selection for each
receiver and transmitter
• Maximum bit rate: 1 x clock - 2 Mb/sec., 16
x clock- 250 Kb/sec.
• Normal, auto-echo, local loop-back and
remote loop-back modes
• Multi-function 16-bit counter/timer
• Programmable interrupt daisy chain
• Up to 32 I/O pins (depending on package
and version)
• Change of state detectors on inputs
• Multidrop mode compatible with 8051 nine-
bit mode
• Stop bits programmable in 1/16-bit increments
• Pin selectable 88xxx/68xxx interface
• Debounced reset pin (20 nsec. min)
• On-chip oscillator for crystal
• Programmable internal clock:X1/CLK or
X1/CLK divided by 2
• Buffered system clock output pin
• Stand-by mode to reduce operating power
• Advanced CMOS low power technology
DESCRIPTION
The Epic Ei68C684/Ei88C684 Quad Universal
Asynchronous Receiver and Transmitter (QUART) is a
data communication device that provides four fully
independent full duplex asynchronous communication
channels in a single package. The QUART is designed
for use in microprocessor based systems and may be
used in a polled or interrupt driven environment.
Two basic versions of the QUART are pin selectable
with SEL pin and each is optimized for use with various
microprocessor families: the Ei88C684 for 8080/5,
8086/88, Z80, Z8000, 68XX and 65XX family based
systems., and the 68C681 for 68000 family based sys-
tems.and the Ei68C684 for 68000family based systems
A programmable mode of the Ei88C684 versions pro-
vides an interrupt daisy chain for use in Z80 and Z8000
based systems. The bus interfaces are however gener-
al enough to allow interfacing with other microprocessors
and microcontrollers. The Ei88C684 and Ei68C684 are
high integrated versions of Epic Semiconductor’s
Ei88C681 and Ei66C681 DUART’s respectively, and are
function compatible with those devices.
OP5
OP6
OP7
D0
D1
D2
D3
D4
D5
D6
D7
WR•
CE•
OP15
OP14
OP13
OP12
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Ei82C684
60 IP5
59 IP4•
58 RD•
57 IP3
56 IP2
55 IP1(CTSB•)
54 IP0(CTSA•)
53 A1
52 A2
51 A3
50 A4
49 A5
48 IP8(CTSC•)
47 IP9(CTSD•)
46 IP10
45 IP11
44 IEI
D0
D1
D2
D3
D4
D5
D6
D7
R/WN
CEN
RXDD
1
Ei82C684
RXDA
RDN
IP1(CTSB)
IP0(CTSA)
A1
A2
A3
A4
A5
IP8(CTSC)
IP9(CTSD)
68-PIN PLCC
44-PIN PLCC
15
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)



IMP
IMP

EI82C684 Datasheet Preview

EI82C684 Datasheet

QUAD UART

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EI82C684 pdf
Semiconductor, Inc.
BLOCK DIAGRAM
Ei68C684
Ei88C684
QUAD UART
TXDx(•)
RXDx
CHANNEL x
TRANSMIT AND
RECEIVE
SHIFT REGISTER
TRANSMIT RECEIVE
HOLDING
FIFO
REGISTER
(3)
MR1x MR2x SRx
INPUT
PORT A
CHANGE
OF
STATE
DETECTORS
(4)
ACRA
IPCRA
INPUT
PORT b
CHANGE
OF
STATE
DETECTORS
(4)
ACRB
IPCRB
OUTPUT
PORT A
FUNCTION
SELECT
LOGIC
OPRA
OPCRA
OUTPUT
PORT B
FUNCTION
SELECT
LOGIC
OPRB
OPCRB
BUS
BUFFER
OPERATION CONTROL
ADDRESS COMMAND
DECODE DECODE
CRA
CRA
CRA
CRA
• ••
INTERNAL DATA BUS
• ••
INTERRUPT
CONTROL
IVRA
IMRA
ISRA
IVRB
IMRB
IVRB
TIMING
CLOCK SELECTORS
COUNTER
TIMER A
COUNTER
TIMER B
BIT RATE
GENERATOR
CRYSTAL
OSCILLATOR
CSRA CSRC ACRA CTURA CTLRA
CSRB CSRD ACRB CTURB CTLRB
16


Part Number EI82C684
Description QUAD UART
Maker IMP
Total Page 2 Pages
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EI82C684 pdf
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