ST16C552AIJ68 datasheet(26/39 Pages) EXAR

26 / 39 page

ST16C552/552A

Rev. 3.40

Logic 0 = -SLCTIN output is set to a logic 1. (normal

default condition)

Logic 1 = -SLCTIN output is set to a logic 0.

CON BIT-4:

This bit enables or masks the printer interrupt output

-INTP. The state of this bit can be read using COM bit-

Logic 0 = Disable -INTP output. (normal default con-

dition)

Logic 1 = Enable -INTP output.

CON BIT-5:

This bit is used in conjunction with the state of BIDEN

to set the direction (input/output) of the PD7-PD0 data

bus.

Logic 0 + BIDEN 1 = PD7-PD0 are set for output mode

(normal default condition)

Logic 1 + BIDEN 1 = PD7-PD0 are set for input mode

CON BIT 6-7:

Not Used - initialized to a logic 1.

ST16C552/552A EXTERNAL RESET CONDITION

REGISTERS

RESET STATE

(UART)

IER

BITS 0-7=0

ISR

ISR BIT-0=1, ISR BITS 1-7=0

LCR

LCR BITS 0-7=0

MCR

MCR BITS 0-7=0

LSR

LSR BITS 0-4=0,

LSR BITS 5-6=1 LSR, BIT 7=0

MSR

MSR BITS 0-3=0,

MSR BITS 4-7=input signals

FCR

FCR BITS 0-7=0

REGISTERS

RESET STATE

Printer Port

IOSEL

IOSEL BITS-0-7=0

SR BITS 0-1=1, BITS 2-7=input

signals

COM

COM BITS 0-4=0, BITS 5-7=1

CON

CON BITS 0-5=0, BITS 6-7=1

SIGNALS

RESET STATE

TX A/B

High

-RTS A/B

High

-DTR A/B

High

INT A/B, P

Three state mode

-RXRDY A/B

High

-TXRDY A/B

Low

PD0-PD7

Low, output mode

-STROBE

High, output mode

-AutoFDXT

High, output mode

INIT

Low, output mode

-SLCTIN

High, output mode

ST16C552AIJ68 Scheda tecnica(PDF) 26 Page - Exar Corporation

ST16C552AIJ68 Scheda tecnica(HTML) 26 Page - Exar Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

Scheda tecnica Scarica

Link URL