W83627UHG Nuvoton Technology Corporation of America, W83627UHG Datasheet - Page 131

• Manufacturer Part Number: W83627UHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627UHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V, 5V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.2.3
The CPU reads the contents of the printer control latch by reading the printer control swapper. The bit
definitions are as follows:
DEFAULT
NAME
BIT
BIT
7-6
7
6
5
4
3
2
1
0
5
4
3
2
1
0
BIT
Printer Control Latch and Printer Control Swapper
BUSY#. 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.
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 5 μs before 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.
1
1
TMOUT. This bit is only valid in EPP mode. A logical 1 indicates that a 10-μs time-out has
occurred on the EPP bus; a logical 0 means hat 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.
These two bits are always read as logical 1 and 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 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 presented for a minimum of 0.5 μs before and
after the strobe pulse.
7
1
6
1
DIR
NA
5
IRQ ENABLE
-120-
DESCRIPTION
DESCRIPTION
4
0
SLCT IN
NA
3
INIT#
NA
2
W83627UHG
AUTO FD
NA
1
STROBE
NA
0