XRT79L71IB datasheet(44/434 Pages) EXAR

44 / 434 page

XRT79L71

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

REV. 1.0.0

General Purpose Data[2]

R/W

General Purpose Data - GPIO_2:

The exact function of this bit-field depends upon whether Gen-

eral Purpose I/O Pin, GPIO_2 (Pin P8) has been configured to

function as an input or an output pin, as described below.

If GPIO_2 is configured to function as an input pin

If GPIO_2 is configured to function as an input pin, then the user

can monitor the state of this particular input pin by reading out

the state of this bit-field.If this bit-field is set to "0" then it means

that GPIO_2 is currently pulled to a logic "Low" level. Con-

versely, if this bit-field is set to "1", then it means that GPIO_2 is

currently pulled to a logic "High" level.

NOTE: If GPIO_2 is configured to function as an input pin, then

writing to this particular register will have no affect on the

state of this pin.

If GPIO_2 is configured to function as an output pin

If GPIO_2 is configured to function as an output pin, then the

user can control the state of this particular output pin by writing

the appropriate value to this bit-field.

Setting this bit-field to "0" will cause GPIO_2 to be driven to a

logic "Low" level. Conversely, setting this bit-field to "1" will

cause GPIO_2 to be driven to a logic "High" level.

NOTE: GPIO_2 can be configured to function as either an input

or output pin, by writing the appropriate value to Bit 2

(General Purpose Pin Direction[2]) within the Operation

General Purpose Pin Direction Control Register

(Address = 0x014B).

General Purpose Data[1]

R/W

General Purpose Data - GPIO_1:

The exact function of this bit-field depends upon whether Gen-

eral Purpose I/O Pin, GPIO_1 (Pin N8) has been configured to

function as an input or an output pin, as described below.

If GPIO_1 is configured to function as an input pin

If GPIO_1 is configured to function as an input pin, then the user

can monitor the state of this particular input pin by reading out

the state of this bit-field.If this bit-field is set to "0" then it means

that GPIO_1 is currently pulled to a logic "Low" level. Con-

versely, if this bit-field is set to "1", then it means that GPIO_1 is

currently pulled to a logic "High" level.

NOTE: If GPIO_1 is configured to function as an input pin, then

writing to this particular register will have no affect on the

state of this pin.

If GPIO_1 is configured to function as an output pin

If GPIO_1 is configured to function as an output pin, then the

user can control the state of this particular output pin by writing

the appropriate value to this bit-field.Setting this bit-field to "0"

will cause GPIO_1 to be driven to a logic "Low" level. Con-

versely, setting this bit-field to "1" will cause GPIO_1 to be driven

to a logic "High" level.

NOTE: GPIO_1 can be configured to function as either an input

or output pin, by writing the appropriate value to Bit 1

(General Purpose Pin Direction[1]) within the Operation

General Purpose Pin Direction Control Register

(Address = 0x014B).

BIT NUMBER

NAME

TYPE

DESCRIPTION

XRT79L71IB Datasheet(PDF) 44 Page - Exar Corporation

XRT79L71IB Datasheet(HTML) 44 Page - Exar Corporation

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