PC87309VLJ datasheet(15/192 Pages) NSC

15 / 192 page

Signal/Pin Connection and Description

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DSR2,1

95,85

UART1,

UART2

Input

Group 1

Data Set Ready – When low, this signal indicates that the data

transfer device, e.g., modem, is ready to establish a communications

link.

DSR2 is multiplexed with DRATE0 and available only in Two-UART

mode.

DSTRB

Parallel Port

Output

Group 8

Data Strobe – This signal is used in EPP mode as a data strobe. It

is active low.

DSTRB is multiplexed with AFD. See TABLE 4-12 on page 101 for

more information.

DTR2,1

96,86

UART1,

UART2

Output

Group 12

Data Terminal Ready – When low, this output signal indicates to the

modem or other data transfer device that the UART1 or UART2 is

ready to establish a communications link.

A Master Reset (MR) deactivates this signal high, and loopback

operation holds this signal inactive.

DTR1 is multiplexed with BADDR0 and with BOUT1.

DTR2 is multiplexed with IRSL2/ID2/BOUT2 and is available only in

Two-UART mode. (BOUT2 is multiplexed implicitly and controlled by

UART2.)

ERR

Parallel Port

Input

Group 3

Error – This input signal is set active low by the printer when it has

detected an error. This pin is internally connected to an internal weak

pull-up.

HDSEL

FDC

Output

Group 11

Head Select – This output signal determines which side of the FDD

is accessed. Active low selects side 1, inactive selects side 0.

ID3

ID2

ID1

ID0

100

UART2

Input

Group 1

Identiﬁcation – These ID signals identify the infrared transceiver for

Plug and Play support. These pins are read after reset.

ID0,1,2 are multiplexed implicitly with IRSL0,1,2 respectively by the

UART2 cell.

ID3 is multiplexed with SIN2.

ID2 is multiplexed with BOUT2, DTR2, IRSL2.

ID1 is multiplexed with RTS2, IRSL1

ID0 is multiplexed with SOUT2,IRSL0, IRRX2

INDEX

FDC

Input

Group 1

Index – This input signal indicates the beginning of an FDD track.

INIT

Parallel Port

I/O

Group 8

Initialize – When this signal is active low, it causes the printer to be

initialized. This signal is in TRI-STATE after a 1 is loaded into the

corresponding control register bit.

An external 4.7 K

Ω pull-up resistor should be employed.

IOCHRDY

ISA-Bus

Output

Group 15

I/O Channel Ready – This is the I/O channel ready open drain output

signal. When IOCHRDY is driven low, the EPP extends the host cycle.

IORD

ISA-Bus

Input

Group 1

I/O Read – An active low RD input signal indicates that the

microprocessor has read data.

IOWR

ISA-Bus

Input

Group 1

I/O Write – WR is an active low input signal that indicates a write

operation from the microprocessor to the controller.

IRQ1

IRQ7-3

IRQ12

31-27

ISA-Bus

I/O

Group 10

Interrupt Requests 1, 3, 4, 5, 6, 7 and 12 – IRQ polarity and push-

pull or open-drain output selection is software conﬁgurable by the

logical device mapped to the IRQ line.

Keyboard Controller (KBC) or Mouse interrupts can be conﬁgured by

the Interrupt Request Type Select 0 register (index 71h) as either

edge or level.

IRRX2,1

100,43

UART2

Input

Group 18

Infrared Reception 1 and 2 – Infrared serial input data.

IRRX1 is multiplexed with P12/DRATE0 and is available only in Two-

UART mode.

IRRX2 is multiplexed with SOUT2/IRSL0/ID0 and is available only in

Full-IR mode.

Signal/Pin

Name

Number

Module

I/O and

Group #

Function

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