Appendixes
56
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
Change in the status of a signal line in compatible
mode
Paper end
Busy : L
H
PError : L
H
Select : H
L
nFault : H
L
Error other than paper end
• Head open
• Other
Busy : L
H
PError : L
unchanged
Select : H
L
nFault : H
L
Conditions for Busy
• Receive buffer full
• Data being read
• Error
Compatible timing specification
[When power is on] (Time it goes off-line)
Reset
BUSY
*ACK
SELECT
PowerOn
[While receiving data]
Data0-7
*Strobe
BUSY
0.5
µ
s
0.5
µ
s
0.5
µ
s
Note:
Busy rises when *Strobe signal starts, and data is latched with
*Strobe signal starts.
