XRT79L71_1 Datasheet, PDF (46/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
REV. 1.0.0
BIT NUMBER
NAME
3
General Purpose Pin
Direction - GPIO_3
2
General Purpose Pin
Direction - GPIO_2
1
General Purpose Pin
Direction - GPIO_1
TYPE
R/W
R/W
R/W
DESCRIPTION
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
Register (Address = 0x0147).
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:
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
Register (Address = 0x0147).
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:
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
Register (Address = 0x0147).
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).
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