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CBM-910 User’s Manual
CITIZEN 20/47
5.3 Description of Input/ Output Signals
(1) Input signal
• DATA 1………..8 bit parallel signal (positive logic)
• DATA 2………..8 bit parallel signal (positive logic)
• DATA 3………..8 bit parallel signal (positive logic)
• DATA 4………..8 bit parallel signal (positive logic)
• DATA 5………..8 bit parallel signal (positive logic)
• DATA 6………..8 bit parallel signal (positive logic)
• DATA 7………..8 bit parallel signal (positive logic)
• DATA 8………..8 bit parallel signal (positive logic)
• STB……………Strobe signal for reading out data (negative logic)
• RESET………..Signal for resetting the entire unit (negative logic)
(2) Output signal
• ACK…………..8 bit data signal for requesting data. ACK is issued at the end of the BUSY signal (negative logic)
• BUSY…………Signal indicating the printer is busy. Input new data when the signal is in “LOW” condition.
(positive logic)
• HI-LEVEL……Connected to Vcc via 3.3 kΩ resistance.
(3) Timing chart
T1 2.7µs MIN
T2 500mS MIN (When power is supplied)
T3 10µs TYP