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Signetics
Microprocessor Products
DESCRIPTION
The Signetics SCC2698 Octal Universal
Asynchronous
Receiver/Transmitter
(Octal-UART)
is
a single-chip MOS-LSI
communications device that provides
an
eight-channel, full-duplex asynchronous
receiver/transmitter
in
a single package.
It
is
fabricated with Signetics' CMOS
technology,
which combines the benefits
of High density and Low power con-
sumption.
The operating speed of each receiver
and
transmitter can
be
selected inde-
pendently
as
one of eighteen fixed baud
rates, a 16 X
clock derived from a pro-
grammable counter/timer, or
an
external
1 X or
16
X clock. The baud rate gener-
ator and counter/timer can operate di-
rectly from a crystal or from external
clock
inputs. The ability to independently
program the operating speed of the
receiver and transmitter make the
Octal-
UART particularly functional for dual-
speed channel applications such as
clustered terminal systems.
The receiver
is
quadruply buffered to
minimize the
potential of receiver over-
run,
or to reduce interrupt overhead
in
interrupt driven systems.
In
addition, a
handshaking capability
is
provided to
disable a remote UART transmitter when
the receiver buffer
is
full.
The Octal-UART provides a power-down
mode
in
which the oscillator
is
frozen but
the register contents are stored. This
results
in
reduced power consumption
on
the order of several magnitudes. The
Octal-UART
is
fully TTL compatible and
operates from a
single +
5V
power sup-
ply.
July 13, 1987
SCC2698
Octal Universal Asynchronous
Receiver /Transmitter
(Octo
I-UART)
Product
Specification
FEATURES
Eight full-duplex asynchronous
receiver
/transmitters
Quadruple buffered receiver data
register
Programmable data format:
- 5
to
8 data bits plus
parity
- Odd, even,
no
parity
or
force
parity
-
1,
1.5
or
2
stop
bits
programmable in
Y16-bit
increments
Baud rate
for
the receiver and
transmitter
selectable from:
-
18
fixed rates:
50
to
38.4k
baud
- Four user-defined rates derived
from
the programmable
counter
/timer
associated with
each
of
the
four
blocks
- External 1 X
or
16
X
clock
Parity, framing, and overrun
error
detection
False
start
bit
detection
Line break detection and
generation
Programmable channel mode
-
Normal (full-duplex), automatic
echo,
local
loop
back, remote
loop
back
Four multi-function programmable
16-bit
counter/timers
Four interrupt
outputs
with eight
maskable interrupting
conditions
for
each
output
On-chip crystal oscillator
TTL compatible
Single
+
5V
power
supply with
Low
power
mode
PIN CONFIGURATIONS
os
RESET
D6
07
CEN
INDEX
CORNER
12
32
TOP
VIEW
11
0
PLCC
33
TOP VIEW
CD09382S
75
-=-
P 74
~
54
53
CDOO45PS
PLCC
Pin
Functions (Next
Page)
853-1267 89720
Seitenansicht 0
1 2 3 4 5 6 ... 37 38

Inhaltsverzeichnis

Seite 1 - Signetics

Signetics Microprocessor Products DESCRIPTION The Signetics SCC2698 Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) is a single-ch

Seite 2 - = + 5V ±

Signetics Microprocessor Products Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) Table 2. Register Bit Formats (Continued) BIT 7

Seite 3

Signetics Microprocessor Products Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) Input Port Register BIT 7 MPI3b 0= Low 1 = High

Seite 4

Signetics Microprocessor Products Octal Universal Asynchronous Receiver /Transmifter (Octal-UART) been lost. It is set upon receipt of a new ch

Seite 5

Signetics Microprocessor Products Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) ISR - Interrupt Status Register This register p

Seite 6

Signetics Microprocessor Products Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) ABSOLUTE MAXIMUM RATINGS1 SYMBOL PARAMETER RATING

Seite 7 - = 1 transmits a one

Signetics Microprocessor Products Octal Universal Asynchronous Receiver jTransmitter (Octal-UART) AC ELECTRICAL CHARACTERISTICS T A = O°C to + 70

Seite 8

Signetics Microprocessor Products Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) +5V () • 1.6kQ Product SpeCification SCC2698 00-07,

Seite 9

Signetics Microprocessor Products Product Specification Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) SCC2698 RDN MPlx WRN MPOx

Seite 10 - SCC2698

Signetics Microprocessor Products Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) TxC (INPUT) TxD TxC (IX OUTPun ----------1 BIT TIM

Seite 11

Signetics Microprocessor Products Product Specification Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) SCC2698 RxD RECEIVER ENABLED

Seite 12

Signetics Microprocessor Products Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) ORDERING INFORMATION DESCRIPTION Vee = + 5V ± 5%, T

Seite 13 - Counterl

DEFINITIONS Data Sheet Identification Product Status Definition Objective Specification Formative or In Design This data sheet contains the

Seite 14

Signetics Microprocessor Division DEVICE ARCHITECTURE The Signetics SCC2698 Octal-UART is composed of four blocks, each logically equivalent to a 26

Seite 15

Signetics Microprocessor Products Octal-UART both the recei ver and transmitter wifl use a 31.25K baud rate. Externally Generated Baud Rate Clock An

Seite 16 - ---J~-~=

,Signetics Microprocessor Products Octal-UART Example 1 CSR-DD HEX Rx & Tx USE TIMER AS 16X BAUD RATE CLOCK ACR[7]=DON'T CARE ACR[6:4]=110 XI

Seite 17 - + (STRAY < SpF)

Signetics Microprocessor Products Octal-UART November 1987 POWER UP HARDWARE RESET CLEAR ERRORS. ENABLE Tx AND Rx CR - H'45' DISABLE/RESET

Seite 18 - \ \

Signetics Microprocessor Products Octal-UART NO POWER UP HARDWARE RESET RECONFIGURE CHANNEL a TO DATA MODE RECONFIGURE CHANNEL a TO ADDRESS MODE NO RE

Seite 19 - ----u--1I

Signetics Microprocessor Products Octal-UART SET CHANNEL BASE ADDRESS -CHANNEL c SET CHANNEL BASE ADDRESS -CHANNEL d NO READ RHR INTO DATA BUFFER F

Seite 20

Signetics Microprocessor Products ·Octal-UART LOCAL LOOPBACK MODE PROGRAM EXAMPLE THIS IS PROGRAM 2698 LOCAL LOOP IT SEPARATELY TESTS-EACH CHANNEL IN

Seite 21

'Signetics Microprocessor Products Application Note ·Octal-UART SCC2698 JSR INIT JSR TEST MOVEA.L I;CHANg!A2 iTEST CHAN g JSR INIT JSR TEST MOVEA

Seite 22 - Octal-UART

Signetics Microprocessor Products Octal-UART WAKE-UP MODE PROGRAM EXAMPLE THIS IS PROGRAM 2698 WAKEUP IT USES CHAN. a AS -THE MASTER STATION, AND CHAN

Seite 23

Signetics Microprocessor Products Product Specification Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) SCC2698 PIN DESCRIPTION PIN

Seite 24

Signetics Microprocessor Products Octal-UART WTDN: MOVE.B ~$Cl,THR[Al] JSR TXRDY MOVE.B H$C2,THR[Al] JSR ADMOOE MOVE.B H$AD,THR[Al] JSR DTMODE MOVE.B

Seite 25

Signetlcs Microprocessor PrC)ducts Octal-UART ;~------------INTERRUPT ROUTINE-------------lNT: CHO: CHKAD: MOVE.B BTST BEQ MOVE.B lSR[A3],02 ~1,02 CHO

Seite 26

VCC 5 45 20 65 r-----I a 41B27I-----' ] R K4IB 17t-----r-------~---------------_+---_;IB/CEN 4L;,SIJ-°_f4 __ r+--'---\~ I ~~---------------

Seite 27 - ·Octal-UART

SigneticS reseNes the right to make changes, without notiCe, in the products, inctuding circuits, standard cells, and/or software, described or conta

Seite 28

~ ____ Ia':.'-:.~ :.~ ~ ________________________ ---... ( , ~ ( Signetics Microprocessor Division SCC2698 Data Sheet Errata February 8,1988

Seite 29

SCC2698A vs. SCC2698B Comparison An enhanced versi on 0 f the SCC2698, to be rna rked SCC2698Bxyznn (wh ere xyznn represent the various temperatur

Seite 30

In removing this logic for the SCC2698B version, the MR1, MR2, CSR, OPCR and ACR regi sters have been made edge tri ggered. Previ ou sly these regi

Seite 31

,4'. Ptn 41 of the 64 pin DIL package was a no connect on the SCC2698A, but becomes a test input on the SCC26988. When using the OIL package, ne

Seite 32 - '

Signetics Microprocessor Division Advance Notice SCC2698B Enhanced Octal UART [J F eatu res of th e SCC2698B [J Maintaining Compatibility with the SCC

Seite 33 - Signe1ics

Signetics Microprocessor Products Product Specification Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) SCC2698 PIN DESCRIPTION (Con

Seite 34 - DIP Pinout Correction

Signetics Microprocessor Products Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) BLOCK DIAGRAM As shown on the block diagram,

Seite 35 - ~"ith

Signetics Microprocessor Products Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) Table 1. Register Addressing AS A4 A3 A2 A1 AO RE

Seite 36

Signetics Microprocessor Products Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) mission of the stop bits, if a new character is

Seite 37 - ,4'. Ptn

Signetics Microprocessor Products Octal Universal Asynchronous Receiver/Transmitter (Octal-UART) bit is loaded into the status FIFO position nor

Seite 38 - Octal UART

Signetics Microprocessor Products Octal Universal Asynchronous Receiver /Transmitfer (Octal-UART) The second diagnostic mode is the remote loopb

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