Publicité
Les langues disponibles
Les langues disponibles
B-1. Interface Specifications
The operating specifications of the parallel interface are as follows.
(1) Data transfer rate
(2) Synchronization
(3) Handshaking
(4) Logic level
B-2. Interface Timing
ACK
Data
STROBE
BUSY
Signal Name
DATA 1-DATA 8
(To Printer)
STROBE
(To Printer)
BUSY, ACK
(From Printer)
Appendix B: Parallel Interface
:
1000 to 6000 characters per second
:
Via externally supplied STROBE pulses
:
ACK and BUSY signals
:
Compatible with TTL level
Approx.9 µs
Fig. B-1 Interface timing diagram
Fig. B-2 Typical interface circuit
– 92 –
T
T
T:more than 0.5 µs
Circuit Example
4.7KΩ
1KΩ
100Ω
470pF
1.8KΩ
T
74HC Compatible
74HC Compatible
74LS Compatible
Publicité
