FDC37C669FR View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

FDC37C669FR

Super I/O Floppy Disk Controller with Fast Infrared Support

SMSC -> Microchip 

QFP

PIN

NO.

84,86

73

DESCRIPTION OF PIN FUNCTIONS

NAME

nRing

Indicator

SYMBOL

nRI1

nRI2

BUFFER

TYPE

I

DESCRIPTION

Active low Ring Indicator inputs for the

serial port. 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.

nPrinter Select

Input

PARALLEL PORT INTERFACE

nSLCTIN

OD24

This active low output selects the printer.

This is the complement of bit 3 of the

Printer Control Register.

74 nInitiate

Output

nINIT

0P24

OD24

Refer to Parallel Port description for use

of this pin in ECP and EPP mode.

This output is bit 2 of the printer control

register. This is used to initiate the

printer when low.

76 nAutofeed

Output

nAUTOFD

0P24

OD24

Refer to Parallel Port description for use

of this pin in ECP and EPP mode.

This output goes low to cause the printer

to automatically feed one line after each

line is printed. The nAUTOFD output is

the complement of bit 1 of the Printer

Control Register.

0P24

Refer to Parallel Port description for use

of this pin in ECP and EPP mode.

11

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