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PC87303 Datasheet(PDF) 75 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # PC87303
Description  PC87303VUL SuperI/OTM Sidewinder Lite Floppy Disk Controller, Keyboard Controller, Real-Time Clock, Dual UARTs, IEEE 1284 Parallel Port, and IDE Inter
PDF  114 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

PC87303 Datasheet(HTML) 75 Page - National Semiconductor (TI)

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70 Parallel Port (Continued)
TABLE 7-5 EPP Registers
Name
Offset
Mode
Type
Description
Data
0
SPP
RW
A write to this register sets the state of the eight data pins on the 25-pin D-shell
(DTR)
EPP
connector
Status
1
SPP
R
A read from this register presents the system microprocessor with the real-time status
(STR)
EPP
of five pins on the 25-pin D-shell connector and the IRQ
Control
2
SPP
RW
A write operation to this port sets the state of four pins on the 25-pin D-shell connector
(CTR)
EPP
and controls both the parallel port interrupt enable and direction
Address
3
EPP
RW
A write operation to this port initiates an EPP deviceregister selection operation
Data
4
EPP
RW
Accesses to this port initiate device read or write operations with bits 0 – 7
Port 0
Data
5
EPP
RW
This port is only accessed to transfer bits 8 to 15 of a 16-bit read or write to data port 0
Port 1
Data
6
EPP
RW
This port is only accessed to transfer bits 16 to 23 of a 32-bit read or write to data port
Port 2
0
Data
7
EPP
RW
This port is only accessed to transfer bits 24 to 31 of a 32-bit read or write to data port
Port 3
0
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