Intel MCS48 User Manual page 401

iny
8295
DOT
MATRIX PRINTER
CONTROLLER
Interfaces
Dot Matrix Printers to
MCS-48™, MCS-80/85™,
MCS-86™
Systems
40 Character Buffer
On
Chip
Serial
or
Parallel
Communication
with
Host
DMA
Transfer Capability
Programmable Character Density
(10
or
12 Chararcters/lnch)
Programmable
Print Intensity
Single or
Double Width
Printing
Programmable Multiple Line
Feeds
3
Tabulations
2 General
Purpose Outputs
The
Intel®
8295 Dot Matrix Printer
Controller provides
an interface for
microprocessors
to
the
LRC
7040
Series dot
matrix
impact
printers.
It
may
also
be used as an interface to other
similar printers.
The
chip
may be used
in
a
serial
or parallel
communication
mode with the host processor.
In
parallel
mode, data
transfers are
based on
polling, interrupts,
or
DMA.
Furthermore,
it
provides
internal
buffering of
up
to 40
characters
and
contains a
7x
7 matrix
character generator
accommodating 64 ASCII
characters.
PIN
CONFIGURATION
PIN
NAMES
BLOCK DIAGRAM
PIN
NAME FUNCTION
D0-D7
DATA BUS
RD,
WR
READ,
WRITE STROBES
CS CHIP SELECT
RESET RESET INPUT
X1.X2
FREQUENCY REFERENCE
INPUTS
SYNC HIGH FREQUENCY OUTPUT
MOT,
PFM
MAIN,
PAPER FEED MOTOR DRIVES
DRO,
DACK DMA REQUEST,
ACKNOWLEDGE
SIN,
CTS SERIAL INPUT, CLEAR
TOSEND
IROfSER INTERRUPT REQUEST, SERIAL
GROUND
S1-S7
SOLENOID DRIVE OUTPUTS
PFEEO PAPER FEED INPUT
HOME, TOF HOME,
TOPOFFORM
INPUTS
STB
SOLENOID STROBE OUTPUT
GP1,
GP2
GENERAL PURPOSE OUTPUTS
VCC. VDO.
gnd
+ 5V POWER,
GND
DACK/SIN
DRQ/CTS
RESET
IRQ/STR
<=
-0
DATA
BUS
BUFFERS
I
i
CONTROL
—
I
TIMING
<^>
<^>
^>
•
STB
MOT
PFM
-
HOME
•
PFEEO
INTEL
CORPORATION ASSUMES NO RESPONSIBILITY FOR THE USE
OF
ANY
CIRCUITRY
OTHER THAN CIRCUITRY EMBODIED
IN
AN INTEL PRODUCT. NO OTHER CIRCUIT PATENT LICENSES ARE
IMPLIED.
(OINTEL CORPORATION, 1979 8-111
00231