FDC37N869 Просмотр технического описания (PDF) - SMSC -> Microchip

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производитель

FDC37N869

5V and 3.3V Super I/O Controller with Infrared Support for Portable Applications

SMSC -> Microchip 

TQFP

PIN #

82,84

NAME

nRing

Indicator

SYMBOL

nRI1

nRI2

BUFFER

MODE6

I

(Note 1)

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.

TQFP

PIN #

71

72

74

75

59

NAME

nPrinter

Select

Input/FDC

nStep

Pulse

(Note 3)

nInitiate

Output/

FDC

nDirection

Control

(Note 3)

nAutofeed

Output/

FDC

nDensity

Select

(Note 3)

nStrobe

Output/

FDC

nDrive

Select 0

(Note 3)

Busy/

FDC

nMotor On

1

SYMBOL

BUFFER

MODE6

DESCRIPTION

PARALLEL PORT INTERFACE (NOTE 2)

nSLCT

(OD14/OP14)/OD12 This active low output selects the printer.

This is the complement of bit 3 of the

Printer Control Register.

Refer to Parallel Port description for use

of this pin in ECP and EPP mode.

nSTEP

See FDC Pin definition.

nINIT

(OD14/OP14)/OD12 This output is bit 2 of the printer control

register. This is used to initiate the printer

when low.

Refer to Parallel Port description for use

of this pin in ECP and EPP mode.

nDIR

See FDC Pin definition.

nAUTOFD (OD14/OP14)/OD12 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.

Refer to Parallel Port description for use

nDENSEL

of this pin in ECP and EPP mode.

See FDC Pin definition.

nSTROBE (OD14/OP14)/OD12 An active low pulse on this output is used

to strobe the printer data into the printer.

The nSTROBE output is the complement

of bit 0 of the Printer Control Register.

Refer to Parallel Port description for use

of this pin in ECP and EPP mode.

nDS0

See FDC Pin definition.

BUSY

I/OD12

This is a status output from the printer, a

high indicating that the printer is not ready

to receive new data. Bit 7 of the Printer

Status Register is the complement of the

BUSY input. Refer to Parallel Port

description for use of this pin in ECP and

nMTR1

EPP mode.

See FDC Pin definition.

SMSC DS – FDC37N869

Page 12

Rev. 11/09/2000

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