LPC47N227-MN View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'LPC47N227-MN' PDF : 202 Pages View PDF
PARALLEL PORT
The LPC47N227 incorporates an IBM XT/AT compatible parallel port. This supports the optional PS/2 type
bi-directional parallel port (SPP), the Enhanced Parallel Port (EPP) and the Extended Capabilities Port
(ECP) parallel port modes. Refer to the Configuration Registers for information on disabling, power down,
changing the base address of the parallel port, and selecting the mode of operation.
The LPC47N227 also provides a mode for support of the floppy disk controller on the parallel port.
The parallel port also incorporates SMSC's ChiProtect circuitry, which prevents possible damage to the
parallel port due to printer power-up.
The functionality of the Parallel Port is achieved through the use of eight addressable ports, with their
associated registers and control gating. The control and data port are read/write by the CPU, the status port
is read/write in the EPP mode. The address map of the Parallel Port is shown below
DATA PORT
STATUS PORT
CONTROL PORT
EPP ADDR PORT
EPP DATA PORT 0
EPP DATA PORT 1
EPP DATA PORT 2
EPP DATA PORT 3
BASE ADDRESS + 00H
BASE ADDRESS + 01H
BASE ADDRESS + 02H
BASE ADDRESS + 03H
BASE ADDRESS + 04H
BASE ADDRESS + 05H
BASE ADDRESS + 06H
BASE ADDRESS + 07H
The bit map of these registers is:
D0
D1
D2
D3
DATA PORT PD0
PD1
PD2
PD3
STATUS
TMOUT
0
0
nERR
PORT
CONTROL STROBE AUTOFD nINIT SLC
PORT
EPP ADDR
PD0
PD1
PD2
PD3
PORT
EPP DATA
PD0
PD1
PD2
PD3
PORT 0
EPP DATA
PD0
PD1
PD2
PD3
PORT 1
EPP DATA
PD0
PD1
PD2
PD3
PORT 2
EPP DATA
PD0
PD1
PD2
PD3
PORT 3
Note 1: These registers are available in all modes.
Note 2: These registers are only available in EPP mode.
D4
PD4
SLCT
IRQE
PD4
PD4
PD4
PD4
PD4
D5
PD5
PE
PCD
PD5
PD5
PD5
PD5
PD5
D6
PD6
nACK
D7
PD7
nBUSY
Note
1
1
0
0
1
PD6 PD7
2
PD6 PD7
2
PD6 PD7
2
PD6 PD7
2
PD6 PD7
2
89
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