W83627DHG-PT Nuvoton Technology Corporation of America, W83627DHG-PT Datasheet - Page 171

• Manufacturer Part Number: W83627DHG-PT
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG-PT

• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

13.2.2 Printer Status Buffer
The CPU reads the printer status by reading the printer status buffer. The bit definitions are as follows:
13.2.3 Printer Control Latch and Printer Control Swapper
The CPU reads the contents of the printer control latch by reading the printer control swapper. The bit
definitions are as follows:
DEFAULT
DEFAULT
NAME
BIT
2-1
BIT
7-6
NAME
7
6
5
4
3
0
5
4
3
2
1
0
BIT
BIT
BUSY#. This signal is active during data entry, when the printer is off-line during printing,
when the printer head is changing position, or in an error state. When this signal is active,
the printer is busy and cannot accept data.
ACK#. This bit represents the current state of the printer’s ACK# signal. A logical 0
means the printer has received a character and is ready to accept another. Normally, this
signal is active for approximately before 5 μs BUSY# stops.
PE. A logical 1 means the printer has detected the end of paper.
SLCT. A logical 1 means the printer is selected.
ERROR#. A logical 0 means the printer has encountered an error condition.
RESERVED. These bits are always read as logical 1.
TMOUT. This bit is only valid in the EPP mode. A logical 1 indicates that a 10 μs time-out
has occurred on the EPP bus. A logical 0 means that no time-out error has occurred.
Writing a logical 1 to this bit clears the time-out status bit; writing a logical 0 has no effect.
RESERVED. These two bits are always read as logical 1. They can be written.
DIR. Direction Control Bit. When this bit is logical 1, the parallel port is in the input mode
(read). When it is logical 0, the parallel port is in the output mode (write). This bit can be
read and written. In the SPP mode, this bit is invalid and fixed at zero.
IRQ ENABLE. A logical 1 allows an interrupt to occur when ACK# changes from low to
high.
SLCT IN. A logical 1 selects the printer.
INIT#. A logical 0 starts the printer (50 microsecond pulse, minimum).
AUTO FD. A logical 1 causes the printer to line-feed after a line is printed.
STROBE. A logical 1 generates an active-high pulse for a minimum of 0.5 μs to clock
data into the printer. Valid data must be present for a minimum of 0.5 μs before and after
the strobe pulse.
BUSY#
NA
7
7
1
RESERVED
ACK#
NA
6
6
1
NA
PE
DIR
NA
5
5
W83627DHG-P/W83627DHG-PT
ENABLE
SLCT
DESCRIPTION
DESCRIPTION
NA
-161-
4
IRQ
4
0
ERROR#
SLCT IN
NA
3
NA
3
Publication Release Date: July 09, 2009
INIT#
NA
2
1
2
RESERVED
AUTO FD
NA
1
1
1
Version 1.94
STROBE
TMOUT
NA
0
0
0