Citizen OPTICAL MOUSE User Manual page 48

Appendixes
Interfaces
Parallel port status signals when an error occurs
The status of a signal line will not be changed in bi-directional mode such as
nibble or ECP mode.
Error
Paper end
Error other than paper end
• Head open
• Other
Conditions for Busy
Compatible timing specification
[When power is on] (Time it goes off-line)
Reset
BUSY
*ACK
SELECT
[While receiving data]
Data0-7
*Strobe
BUSY
Note: Busy rises when *Strobe signal starts, and data is latched with *Strobe
signal starts.
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Change in the status of a signal line in
compatible mode
Busy : L H
PError : L H
Select : H L
nFault : H L
Busy : L H
PError : L unchanged
Select : H L
nFault : H L
• Receive buffer full
• Data being read
• Error
PowerOn
0.5µs
0.5µs
0.5µs