W83L517D Datasheet, PDF (95/138 Pages) Winbond – LPC SUPER I/O

W83L517D
6.2.2 Printer Status Buffer
Version 0.6
The system microprocessor can read the printer status by reading the address of the printer status buffer.
The bit definitions are as follows:
76 5 4 321 0
11
TMOUT
ERROR
SLCT
PE
ACK
BUSY
Bit 7: This signal is active during data entry, when the printer is off-line during printing, when the print
head is changing position, or during an error state. When this signal is active, the printer is busy
and cannot accept data.
Bit 6: This bit represents the current state of the printer's ACK# signal. A 0 means the printer has
received a character and is ready to accept another. Normally, this signal will be active for
approximately 5 microseconds before BUSY# stops.
Bit 5: Logical 1 means the printer has detected the end of paper.
Bit 4: Logical 1 means the printer is selected.
Bit 3: Logical 0 means the printer has encountered an error condition.
Bit 1, 2: These two bits are not implemented and are logic one during a read of the status register.
Bit 0: This bit is valid in EPP mode only. It indicates that a 10 µS time-out has occurred on the EPP bus.
A logic 0 means that no time-out error has occurred; a logic 1 means that a time-out error has
been detected. Writing a logic 1 to this bit will clear the time-out status bit; writing a logic 0 has no
effect.
88
Publication Release Date: Apr. 2000
Revision 0.60