Citizen CL-S400DT User Manual page 62

Appendixes
Interfaces
[While receiving INIT signal]
Min. 10 to 15µsec
*Init
BUSY
*Ack
*Fault
SELECT
Note: If the *Init signal does not have width of 10 to 15μsec 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.
Relation of the timing of the BUSY signal and the *ACK signal
[Center – ACK]
BUSY
*ACK
62
2 µsec