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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 P O R T B : 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
( M 1 N )
l ^ s ( M I N )
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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