XRT79L71_1 Datasheet, PDF (47/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

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XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
BIT NUMBER
NAME
0
General Purpose Pin
Direction - GPIO_0
TYPE
R/W
DESCRIPTION
General Purpose Pin Direction - GPIO_0:
This READ/WRITE bit-field permits the user to define the Gen-
eral Purpose I/O Pin, GPIO_0 (Pin T7) as either in Input pin or
an Output pin, as described below.0 - Configures GPIO_0 (Pin
T7) to function as an input pin.1 - Configures GPIO_0 (Pin T7) to
function as an output pin.
NOTES:
1. If GPIO_0 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 0 (General Purpose Data[0])
within the Operation General Purpose Pin Data
Register (Address = 0x0147).
2. If GPIO_0 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 0 (General
Purpose Data[0]) within the Operation General Purpose
Pin Data Register (Address =0x0147).
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