ST78C34IP40 datasheet(8/21 Pages) EXAR

8 / 21 page

6-10

ST78C34

Rev. 3.00

COM BIT-2:

INIT input pin.

0= INIT pin is in low state

1= INIT pin is in high state

COM BIT-3:

-SLCTIN input pin.

0= -SLCTIN pin is in high state

1= -SLCTIN pin is in low state

COM BIT-4:

Interrupt mask.

0= Interrupt (INT output) is disabled

1= Interrupt (INT output) is enabled

COM BIT 7-5:

Not used. Are set to “1” permanently.

CONTROL REGISTER.

Writing to this register will set the state of the -

STROBE, -AUTOFDXT, INIT, SLCTIN pins, and in-

terrupt mask register.

CON BIT-0:

-STROBE output control bit.

0= -STROBE output is set to high state

1= -STROBE output is set to low state

CON BIT-1:

-AUTOFDXT output control bit.

0= -AUTOFDXT output is set to high state

1= -AUTOFDXT output is set to low state

CON BIT-2:

INIT output control bit.

0= INIT output is set to low state

1= INIT output is set to high state

CON BIT-3:

-SLCTIN output control bit.

0= -SLCTIN output is set to high state

1= -SLCTIN output is set to low state

CON BIT-4:

Interrupt output control bit.

0= INT output is disabled (three state mode)

1= INT output is enabled

CON BIT-5:

I/O select. Direction of the PD7-PD0 can be selected

by setting or clearing this bit.

0= PD7-PD0 are set for output mode

1= PD7-PD0 are set for input mode

CON BIT 7-6:

Not used.

ALTERNATE FUNCTION REGISTER (AFR)

This register En/Disables FIFO operation and pro-

vides additional capabilities to control -STROBE. INT

and change interrupt functions.

AFR BIT 0-2:

Timing select.

The -STROBE delay and width can be controlled by

these bits.

AFR

TSD

TSW

Bit-2

Bit-1

Bit-0

(clocks)

100

101

110

111

000

001

010

AFR BIT-3:

Interrupt source.

0= -ACK input pin is selected as printer handshaking

source

1= BUSY input pin is selected as printer handshaking

source

AFR BIT 4-5:

Interrupt type. State of the INT output pin can be

selected for one of the following options.

ST78C34IP40 bảng dữ liệu(PDF) 8 Page - Exar Corporation

ST78C34IP40 bảng dữ liệu(HTML) 8 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

bảng dữ liệu tải về

Link URL