FDC37B787QF SMSC [SMSC Corporation], FDC37B787QF Datasheet - Page 126
FDC37B787QF
Manufacturer Part Number
FDC37B787QF
Description
Super I/O Controller with ACPI Support, Real Time Clock and Consumer IR
Manufacturer
SMSC [SMSC Corporation]
Datasheet
1.FDC37B787QF.pdf
(249 pages)
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When a GPIO port is programmed as an input,
reading it through the GPIO data register latches
either the inverted or non-inverted logic value
present at the GPIO pin. Writing to a GPIO port
that is programmed as an input has no effect.
HOST OPERATION
WRITE
READ
TABLE 56 - GPIO READ/WRITE BEHAVIOR
LATCHED VALUE OF GPIO PIN LAST WRITE TO GPIO DATA
NO EFFECT
GPIO INPUT PORT
128
When a GPIO port is programmed as an output,
the logic value or the inverted logic value that has
been written into the GPIO data register is output
to the GPIO pin. Reading from a GPIO port that is
programmed as an output returns the last value
written to the data register.
REGISTER
BIT PLACED IN GPIO DATA
REGISTER
GPIO OUTPUT PORT
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