ST16C452 datasheet(21/30 Pages) EXAR

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ST16C452/452PS

Rev. 3.20

CON BIT-5:

[452PS only]

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.

ST16C452/452PS

EXTERNAL RESET

CONDI-

TION

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

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

PD0-PD7

Low, output mode

-STROBE

High, output mode

-AutoFDXT

High, output mode

INIT

Low, output mode

-SLCTIN

High, output mode

ST16C452 Datasheet(PDF) 21 Page - Exar Corporation

ST16C452 Datasheet(HTML) 21 Page - Exar Corporation

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