FDC37C665IR Ver la hoja de datos (PDF) - SMSC -> Microchip
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FDC37C665IR Datasheet PDF : 162 Pages
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PIN NO.
NAME
84,86 nRing Indicator
94 Drive 2
DESCRIPTION OF PIN FUNCTIONS
BUFFER
SYMBOL TYPE
DESCRIPTION
nRI1, nRI2
I
Active low Ring Indicator input for primary
and secondary serial ports. Handshake
signal which notifies the UART that the
telephone ring signal is detected by the
modem. The CPU can monitor the status of
nRI signal by reading bit 6 of Modem Status
Register (MSR). A nRI signal state change
from low to high after the last MSR read will
set MSR bit 2 to a 1. If bit 3 of Interrupt
Enable Register is set, the interrupt is
generated when nRI changes state. Note:
Bit 6 of MSR is the complement of nRI.
DRV2
I/O2 In PS/2 mode, this input indicates whether a
second drive is connected; DRV2 should be
low if a second drive is connected. This
status is reflected in a read of Status
Register A.
nADRx
nADRx
O2 Optional I/O port address decode output.
Refer to Configuration registers CR3, CR8
and CR9 for more information. Active low.
(Available in the FDC37C665IR.) Defaults
to tri-state after power-up. This pin has a
30ua internal pull-up.
Parallel Port
Interrupt
Request 2
PINTR2
O12 This interrupt from the Parallel Port is
enabled/disabled via bit 4 of the Parallel
Port Control Register.
Refer to
configuration registers CR1 and CR3 for
more information.
PARALLEL PORT INTERFACE
73 nPrinter Select nSLCTIN
Input
OD12
This active low output selects the printer.
This is the complement of bit 3 of the Printer
Control Register.
0P12 Refer to Parallel Port description for use of
this pin in ECP and EPP mode.
74 nInitiate Output nINIT
OD12
This output is bit 2 of the printer control
register. This is used to initiate the printer
when low.
0P12 Refer to Parallel Port description for use of
this pin in ECP and EPP mode.
11
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