NCT6627UD Nuvoton Technology Corporation of America, NCT6627UD Datasheet - Page 134

• Manufacturer Part Number: NCT6627UD
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of NCT6627UD

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Notes:
1. These registers are available in all modes.
2. These registers are available only in EPP mode.
Each register (or pair of registers, in some cases) is discussed below.
The CPU reads the contents of the printer’s data latch by reading the data port.
The CPU reads the printer status by reading the printer status buffer. The bit definitions are as follows:
DEFAULT
EPP Address Port (R/W)
Control Swapper (Read)
EPP Data Port 0 (R/W)
EPP Data Port 1 (R/W)
EPP Data Port 2 (R/W)
EPP Data Port 3 (R/W)
BIT
NAME
Control Latch (Write)
11.2.1
11.2.2
Status Buffer (Read)
7
6
5
4
3
BIT
A2
1
1
Data Port (R/W)
REGISTER
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.
Data Port (Data Swapper)
Printer Status Buffer
BUSY#
NA
A1
7
1
1
BUSY#
ACK#
PD7
PD7
PD7
PD7
PD7
PD7
Table 11-3 Address and Bit Map for SPP and EPP Modes
NA
7
1
1
6
A0
0
1
ACK#
PD6
PD6
PD6
PD6
PD6
PD6
6
1
1
NA
PE
5
PD5
PD5
PD5
PD5
PD5
PD5
DIR
PE
5
1
DESCRIPTION
SLCT
NA
IRQEN
SLCT
4
PD4
PD4
PD4
PD4
PD4
PD4
IRQ
EPP data port 2 (R/W)
EPP data port 2 (R/W)
4
REGISTER
ERROR#
ERROR#
-125-
NA
SLIN
SLIN
PD3
PD3
PD3
PD3
PD3
PD3
3
3
W83627UHG/NCT6627UD
INIT#
INIT#
PD2
PD2
PD2
PD2
PD2
PD2
2
1
Publication Release Date: October 26, 2010
2
1
AUTOFD#
AUTOFD#
PD1
PD1
PD1
PD1
PD1
PD1
1
1
1
1
STROBE#
STROBE#
NOTE
TMOUT
TMOUT
PD0
PD0
PD0
PD0
PD0
PD0
2
2
0
0
0
Revision 1.7