ST16C452IJ68PS datasheet(3/30 Pages) EXAR

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ST16C452/452PS

Rev. 3.20

SYMBOL DESCRIPTION

Symbol

Signal Type

Pin Description

A0

35

I

Address-0 Select Bit - Internal registers address selection.

A1

34

I

Address-1 Select Bit - Internal registers address selection.

A2

33

I

Address-2 Select Bit - Internal registers address selection.

-ACK

68

I

Acknowledge (with internal pull-up) - General purpose input

or line printer acknowledge (active low). a logic 0 from the

printer, indicates successful data transfer to the print buffer.

-AutoFDXT

56

I/O

General purpose I/O (open drain, with internal pull-up) or

automatic line feed (open drain input with internal pull-up).

When this signal is low the printer should automatically line

feed after each line is printed.

BIDEN

1

I

Bi-Direction Enable - PD7-PD0 direction select. A logic 0

sets the parallel port for I/O Select Register Control. A logic

1 sets the parallel port for Control Register Bit-5 Control.

BUSY

66

I

Busy (with internal pull-up) - General purpose input or line

printer busy (active high). can be used as an output from the

printer to indicate printer is not ready to accept data.

CLK

4

I

Clock Input. - An external clock must be connected to this

pin to clock the baud rate generator and internal circuitry

(see Programmable Baud Rate Generator).

-CSA

32

I

Chip Select A - A logic 0 at this pin enables the serial

channel-A UART registers for CPU data transfers.

-CSB

3

I

Chip Select B - A logic 0 at this pin enables the serial

channel-B UART registers for CPU data transfers.

-CSP

38

I

Printer Port Chip Select - (active low). A logic 0 at this pin

enables the parallel printer port registers and/or PD7-PD0

for external CPU data transfers.

D0-D7

14-21

I/O

Data Bus (Bi-directional) - These pins are the eight bit, three

state data bus for transferring information to or from the

controlling CPU. D0 is the least significant bit and the first

data bit in a transmit or receive serial data stream.

Số phần tương tự - ST16C452IJ68PS

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Exar Corporation	ST16C452IJ68PS	162Kb / 30P	DUAL UART WITH PARALLEL PRINTER PORT

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nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Exar Corporation	ST16C452	162Kb / 30P	DUAL UART WITH PARALLEL PRINTER PORT
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