CITIZEN CL-S521 - Manual (Page 55)

55
Appendixes
Interfaces
Relation of the timing of the BUSY signal and the *ACK signal
[Center – ACK]
[While receiving INIT signal]
Note: If the *Init signal does not have width of 10 to 15 µsec or more, it
cannot act as an Init signal. If it is lower, the *Init signal is ignored.
BUSY starts up when the *Init signal is perceived.
BUSY
*ACK
2 µ sec
BUSY
*Init
*Ack
*Fault
SELECT
Min. 10 to 15 µ sec