ST16C552AIJ68 datasheet(25/39 Pages) EXAR

25 / 39 page

ST16C552/552A

Rev. 3.40

source driver and internal pull-up so that it may be wire-

or’d with other outputs. COM bit-1 is used to read status

while CON bit 1 is used to set an output state. If it is to

function as an input, CON bit-1 shall be set to a logic 1

first.

Logic 0 = -STROBE pin is a logic 1. (normal default

condition)

Logic 1 = -STROBE pin is a logic 0.

COM BIT-1:

-AutoFDXT is a bi-directional signal with an open

source driver and internal pull-up so that it may be

wire-or’d with other outputs. COM bit-1 is used to read

status while CON bit 1 is used to set an output state.

If it is to function as an input, CON bit-1 shall be set to

a logic 1 first.

Logic 0 = -AutoFDXT pin is a logic 1. (normal default

condition)

1= -AutoFDXT pin is a logic 0.

COM BIT-2:

INIT is a bi-directional signal with an open source

driver and internal pull-up so that it may be wire-or’d

with other outputs. COM bit-2 is used to read status

while CON bit 2 is used to set an output state. If it is to

function as an input, CON bit-1 shall be set to a logic

1 first.

Logic 0 = INIT pin is a logic 0. (normal default

condition)

Logic 1 = INIT pin is a logic 1.

COM BIT-3:

-SLCTIN is a bi-directional signal with an open source

driver and internal pull-up so that it may be wire-or’d

with other outputs. COM bit-1 is used to read status

while CON bit 1 is used to set an output state. If it is to

function as an input, CON bit-1 shall be set to a logic

1 first.

Logic 0 = -SLCTIN pin is a logic 1 (normal default

condition)

Logic 1 = -SLCTIN pin is a logic 0

COM BIT-4:

This bit allows the state of -INTP to be read back by the

external CPU.

Logic 0 = Interrupt (-INTP output) is disabled (normal

default condition)

Logic 1 = Interrupt (-INTP output) is enabled

COM BIT 5-7:

Not Used - initialized to a logic 1.

Control Register (CON)

This register provides control of the printer port output

logical states and controls the printer interrupts INIT

and -INTP. With the exception of PD 0-7 IN/OUT, the

status of this register may be read by reading the COM

CON BIT-0:

The -STROBE output control bit is under software

control, i.e., the hardware will not generate a strobe. It

is up to software to return the state of -STROBE to the

inactive (logic 1) state. The hardware driver is open

drain so that -STROBE may be wire-or’d. The state of

this bit can be read using COM bit-0.

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

default condition)

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

CON BIT-1:

The -AutoFDXT output control bit is set by software

using CON bit-1. The hardware driver is open drain so

that -AutoFDXT may be wire-or’d. The state of this bit

can be read using COM bit-1.

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

default condition)

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

CON BIT-2:

The INIT output control bit is set by software using

CON bit-2. The hardware driver is open drain so that

INIT may be wire-or’d. The state of this bit can be read

using COM bit-2.

Logic 0 = INIT output is set to a logic 0. (normal default

condition)

Logic 1 = INIT output is set to a logic 1.

CON BIT-3:

The -SLCTIN output control bit is set by software using

CON bit-3. The hardware driver is open drain so that

-AutoFDXT may be wire-or’d. The state of this bit can

be read using COM bit-3.

ST16C552AIJ68 Scheda tecnica(PDF) 25 Page - Exar Corporation

ST16C552AIJ68 Scheda tecnica(HTML) 25 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