FDC37B78X データシートの表示（PDF） - SMSC -> Microchip

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FDC37B78X

Enhanced Super I/O Controller with ACPI Support, Real Time Clock and Consumer IR

SMSC -> Microchip 

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.

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.

TABLE 56 - GPIO READ/WRITE BEHAVIOR

HOST OPERATION

READ

WRITE

GPIO INPUT PORT

LATCHED VALUE OF GPIO

PIN

NO EFFECT

GPIO OUTPUT PORT

LAST WRITE TO GPIO DATA

REGISTER

BIT PLACED IN GPIO DATA

REGISTER

128

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