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7-3. General description
of the
parallel interface
The
8255
is
used
for the LSI to
control
the
parallel inter-
face.
The
8255
can be set in the
following mode.
/PORT
A:
MODE
0
I
PORTB: MODE
1
C:
Output
Because
it is not
possible
to
directly
sense
the ACK
signal
as
it
uses
interrupt
for key
processing
and
RS232C
input,
the
ACK
signal
is
latched
by
means
of the OBF pin
function
74.
Data
transfer
timing
BUSY
ACK
(
8255
A
v
PC-7
J
DATA
STROBE
(M1N)
l^s(MIN)
PRINTER:
MZ-1P02, MZ-1P03
CE-
330P, 331P, 332P
*
Broken line
in the
above
figure
represents
timing
for the
CE-330Pand331P.
'For detail
of
timing,
refer
to
Manual
provided
with
printer.
7-5. General
description
of
control
software
Set
the 20
second
counter.
STROBE
OUT
Set the 20
second
counter.
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