w83l517g Winbond Electronics Corp America, w83l517g Datasheet - Page 92

• Manufacturer Part Number: w83l517g
• Description: Winbond Lpc I/o For Notebook W83l517d/ W83l517d-f
• Manufacturer: Winbond Electronics Corp America

9.2.1
The system microprocessor can read the contents of the printer's data latch by reading the data
swapper.
9.2.2
The system microprocessor can read the printer status by reading the address of the printer status
buffer. The bit definitions are as follows:
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
received a character and is ready to accept another. Normally, this signal will be active for
approximately 5 microseconds before
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 μ S 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.
9.2.3
The system microprocessor can read the contents of the printer control latch by reading the printer
control swapper. Bit definitions are as follows:
Printer Status Buffer
Printer Control Latch and Printer Control Swapper
Data Swapper
7
6
BUSY#
5
4
stops.
- 92 -
3
1
2
1
1
W83L517D/W83L517D-F
0
ACK#
TMOUT
ERROR
SLCT
PE
ACK
BUSY
signal. A 0 means the printer has