XRT79L71IB datasheet(46/434 Pages) EXAR

46 / 434 page

XRT79L71

1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION

REV. 1.0.0

General Purpose Pin

Direction - GPIO_3

R/W

General Purpose Pin Direction - GPIO_3:

This READ/WRITE bit-field permits the user to define the Gen-

eral Purpose I/O Pin, GPIO_3 (Pin R8) as either in Input pin or

an Output pin, as described below.0 - Configures GPIO_3 (Pin

R8) to function as an input pin.1 - Configures GPIO_3 (Pin R8) to

function as an output pin.

NOTES:

1. If GPIO_3 is configured to function as an input pin, then

the user can monitor the state of this input pin by

reading out the state of Bit 3 (General Purpose Data[3])

within the Operation General Purpose Pin Data

2. If GPIO_3 is configured to function as an output pin,

then the user can control the state of this output pin by

writing the appropriate value into Bit 3 (General

Purpose Data[3]) within the Operation General Purpose

Pin Data Register (Address =0x0147).

General Purpose Pin

Direction - GPIO_2

R/W

General Purpose Pin Direction - GPIO_2:

This READ/WRITE bit-field permits the user to define the Gen-

eral Purpose I/O Pin, GPIO_2 (Pin P8) as either in Input pin or

an Output pin, as described below.0 - Configures GPIO_2 (Pin

P8) to function as an input pin.1 - Configures GPIO_2 (Pin P8) to

function as an output pin.

NOTES:

1. If GPIO_2 is configured to function as an input pin, then

the user can monitor the state of this input pin by

reading out the state of Bit 2 (General Purpose Data[2])

within the Operation General Purpose Pin Data

2. If GPIO_2 is configured to function as an output pin,

then the user can control the state of this output pin by

writing the appropriate value into Bit 2 (General

Purpose Data[2]) within the Operation General Purpose

Pin Data Register (Address =0x0147).

General Purpose Pin

Direction - GPIO_1

R/W

General Purpose Pin Direction - GPIO_1:

This READ/WRITE bit-field permits the user to define the Gen-

eral Purpose I/O Pin, GPIO_1 (Pin N8) as either in Input pin or

an Output pin, as described below.0 - Configures GPIO_1 (Pin

N8) to function as an input pin.1 - Configures GPIO_1 (Pin N8) to

function as an output pin.

NOTES:

1. If GPIO_1 is configured to function as an input pin, then

the user can monitor the state of this input pin by

reading out the state of Bit 1 (General Purpose Data[1])

within the Operation General Purpose Pin Data

2. If GPIO_1 is configured to function as an output pin,

then the user can control the state of this output pin by

writing the appropriate value into Bit 1 (General

Purpose Data[1]) within the Operation General Purpose

Pin Data Register (Address =0x0147).

BIT NUMBER

NAME

TYPE

DESCRIPTION

XRT79L71IB Datasheet(PDF) 46 Page - Exar Corporation

XRT79L71IB Datasheet(HTML) 46 Page - Exar Corporation

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