Citizen CL-S521 User Manual page 55

[While receiving INIT signal]
Min. 10 to 15 sec
*Init
BUSY
*Ack
*Fault
SELECT
Note: If the *Init signal does not have width of 10 to 15 µ sec 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
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