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34.4 Functional description
34.4.1 General-purpose input
The logic state of each pin is available via the Port Data Input registers, provided the pin
is configured for a digital function and the corresponding Port Control and Interrupt
module is enabled.
34.4.2 General-purpose output
The logic state of each pin can be controlled via the port data output registers and port
data direction registers, provided the pin is configured for the GPIO function. The
following table depicts the conditions for a pin to be configured as input/output.
If
Then
A pin is configured for the GPIO function and the
corresponding port data direction register bit is clear.
The pin is configured as an input.
A pin is configured for the GPIO function and the
corresponding port data direction register bit is set.
The pin is configured as an output and and the logic state of
the pin is equal to the corresponding port data output register.
To facilitate efficient bit manipulation on the general-purpose outputs, pin data set, pin
data clear, and pin data toggle registers exist to allow one or more outputs within one port
to be set, cleared, or toggled from a single register write.
The corresponding Port Control and Interrupt module does not need to be enabled to
update the state of the port data direction registers and port data output registers including
the set/clear/toggle registers.
34.4.3 IOPORT
The GPIO registers are also aliased to the IOPORT interface on the Cortex-M0+ from
address 0xF800_0000. Accesses via the IOPORT interface occur in parallel with any
instruction fetches and will therefore complete in a single cycle. If the DMA attempts to
access the GPIO registers on the same cycle as an IOPORT access, then the DMA access
will stall until any IOPORT accesses have completed.
Chapter 34 General-Purpose Input/Output (GPIO)
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc.
685
Содержание MKW01Z128
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