fdc37m707 Standard Microsystems Corp., fdc37m707 Datasheet - Page 83
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fdc37m707
Manufacturer Part Number
fdc37m707
Description
Fdc37m707 Enhanced Super I/o Controller With Wake-up Features
Manufacturer
Standard Microsystems Corp.
Datasheet
1.FDC37M707.pdf
(194 pages)
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IBM XT/AT COMPATIBLE, BI-DIRECTIONAL
AND EPP MODES
DATA PORT
ADDRESS OFFSET = 00H
The Data Port is located at an offset of '00H'
from the base address.
cleared at initialization by RESET.
WRITE operation, the Data Register latches the
contents of the data bus with the rising edge of
the nIOW input. The contents of this register
are buffered (non inverting) and output onto the
PD0 - PD7 ports. During a READ operation in
SPP mode, PD0 - PD7 ports are buffered (not
latched) and output to the host CPU.
STATUS PORT
ADDRESS OFFSET = 01H
The Status Port is located at an offset of '01H'
from the base address.
register are latched for the duration of an nIOR
read cycle.
defined as follows:
BIT 0 TMOUT - TIME OUT
This bit is valid in EPP mode only and indicates
that a 10 usec time out has occurred on the
EPP bus. A logic O means that no time out
error has occurred; a logic 1 means that a time
out error has been detected. This bit is cleared
by a RESET. Writing a one to this bit clears the
time out status bit. On a write, this bit is self
clearing and does not require a write of a zero.
Writing a zero to this bit has no effect.
BITS 1, 2 - are not implemented as register bits,
during a read of the Printer Status Register
these bits are a low level.
BIT 3 nERR - nERROR
The level on the nERROR input is read by the
CPU as bit 3 of the Printer Status Register. A
logic 0 means an error has been detected; a
logic 1 means no error has been detected.
The bits of the Status Port are
The contents of this
The data register is
During a
83
BIT 4 SLCT - PRINTER SELECTED STATUS
The level on the SLCT input is read by the CPU
as bit 4 of the Printer Status Register. A logic 1
means the printer is on line; a logic 0 means it is
not selected.
BIT 5 PE - PAPER END
The level on the PE input is read by the CPU as
bit 5 of the Printer Status Register. A logic 1
indicates a paper end; a logic 0 indicates the
presence of paper.
BIT 6 nACK - nACKNOWLEDGE
The level on the nACK input is read by the CPU
as bit 6 of the Printer Status Register. A logic 0
means that the printer has received a character
and can now accept another. A logic 1 means
that it is still processing the last character or has
not received the data.
BIT 7 nBUSY - nBUSY
The complement of the level on the BUSY input
is read by the CPU as bit 7 of the Printer Status
Register. A logic 0 in this bit means that the
printer is busy and cannot accept a new
character. A logic 1 means that it is ready to
accept the next character.
CONTROL PORT
ADDRESS OFFSET = 02H
The Control Port is located at an offset of '02H'
from the base address. The Control Register is
initialized by the RESET input, bits 0 to 5 only
being affected; bits 6 and 7 are hard wired low.
BIT 0 STROBE - STROBE
This bit is inverted and output onto the
nSTROBE output.
BIT 1 AUTOFD - AUTOFEED
This bit is inverted and output onto the
nAUTOFD output. A logic 1 causes the printer
to generate a line feed after each line is printed.
A logic 0 means no autofeed.
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