PC87309VLJ datasheet(13/192 Pages) NSC

13 / 192 page

Signal/Pin Connection and Description

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1.2

SIGNAL/PIN DESCRIPTIONS

TABLE 1-1 lists the signals of the PC87309 in alphabetical

order and shows the pin(s) associated with each. TABLE

1-2 on page 18 lists the signals that are multiplexed in Full-

IR and Two-UART modes. TABLE 1-3 on page 18 lists the

pins that have strap functions during reset.

The Module column indicates the functional module that is

associated with these pins. In this column, the System label

indicates internal functions that are common to more than

one module. The I/O and Group # column describes wheth-

er the pin is an input, output, or bidirectional pin (marked as

Input, Output or I/O, respectively).

TABLE 1-1. Signal/Pin Description Table

Signal/Pin

Name

Number

Module

I/O and

Group #

Function

A11-0

93, 20-16,

14-9

ISA-Bus

Input

Group 1

ISA-Bus Address – A11-0 are used for address decoding on any

access except DMA accesses, on the condition that the AEN signal is

low.

A11 is multiplexed with CTS2 on pin 93 and available in Full-IR mode

only. Since A11 is required to support full ISA PnP mode (for

decoding A79h), this mode is not available in Two-UART mode.

See Section 2.2.2.

ACK

Parallel Port

Input

Group 3

Acknowledge – This input signal is pulsed low by the printer to

indicate that it has received data from the parallel port. This pin is

internally connected to an internal weak pull-up.

AFD

Parallel Port

I/O

Group 8

Automatic Feed – When this signal is low the printer should

automatically feed a line after printing each line. This pin is in TRI-

STATE after a 0 is loaded into the corresponding control register bit.

An external 4.7 K

Ω pull-up resistor should be attached to this pin.

This signal is multiplexed with DSTRB. See TABLE 4-12 on page 101

for more information.

AEN

ISA-Bus

Input

Group 1

DMA Address Enable – This input signal disables function selection

via A11-0 when it is high. Access during DMA transfer is not affected

by this signal. This pin is used for external decoding of A11-15 in

Two-UART mode or A15-12 in Full-IR mode.

ASTRB

Parallel Port

Output

Group 8

Address Strobe (EPP) – This signal is used in EPP mode as an

address strobe. It is active low.

This signal is multiplexed with SLIN. See TABLE 4-12 on page 101 for

more information.

BADDR1,0

88,86

Conﬁguration

Input

Group 4

Base Address Strap Pins 0 and 1 – These pins determine the base

addresses of the Index and Data registers, the value of the Plug and

Play ISA Serial Identiﬁer and the conﬁguration state immediately after

reset. These pins are pulled down by internal 30 K

Ω resistors.

External 10 K

Ω pull-up resistors to V

DD should be employed.

BADDR1 is multiplexed with RTS1.

BADDR0 is multiplexed with DTR1 and BOUT1.

See TABLE 2-1 and Section 2.1.

BOUT2,1

96,86

UART1,

UART2

Output

Group 12

Baud Output – This multi-function pin provides the associated serial

channel Baud Rate generator output signal if test mode is selected,

i.e., bit 7 of the EXCR1 register is set. See “Bit 7 - Baud Generator

Test (BTEST)” on page 121.

After Master Reset this pin provides the DTR function.

BOUT2 is multiplexed with DTR2, IRSL2 and ID2.

BOUT1 is multiplexed with DRT1 and BADDR0.

BUSY

Parallel Port

Input

Group 2

Busy – This pin is set high by the printer when it cannot accept

another character. It is internally connected to a weak pull-down

resistor.

This signal is multiplexed with WAIT. See TABLE 4-12 on page 101 for

more information.

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