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    257
    32133D鈥�11/2011
    UC3D
    18.6.2
    Advanced Operation
    18.6.2.1
    Peripheral I/O Pin Control
    When a GPIO pin is assigned to a peripheral function, i.e. the corresponding bit in GPER is zero,
    output and output enable is controlled by the selected peripheral pin. In addition the peripheral
    may control some or all of the other GPIO pin functions listed in Table 18-1, if the peripheral sup-
    ports those features. All pin features not controlled by the selected peripheral is controlled by the
    GPIO.
    Refer to the Module Configuration section for details regarding implemented GPIO pin functions
    and to the Peripheral chapter for details regarding I/O pin function control.
    18.6.2.2
    Pull-up Resistor Control
    Pull-up can be configured for each GPIO pin. Pull-up allows the pin and any connected net to be
    pulled up to VDD if the net is not driven.
    Pull-up is useful for detecting if a pin is unconnected or if a mechanical button is pressed, for var-
    ious communication protocols and to keep unconnected pins from floating.
    Pull-up can be enabled and disabled by writing a one and a zero respectively to the correspond-
    ing bit in the Pull-up Enable Register (PUER).
    18.6.2.3
    Output Pin Timings
    Figure 18-3 shows the timing of the GPIO pin when writing to the Output Value Register (OVR).
    The same timing applies when performing a 鈥榮et鈥� or 鈥榗lear鈥� access, i.e. writing to OVRS or
    OVRC. The timing of PVR is also shown.
    Figure 18-3. Output Pin Timings
    18.6.2.4
    Interrupts
    The GPIO can be configured to generate an interrupt when it detects a change on a GPIO pin.
    Interrupts on a pin are enabled by writing a one to the corresponding bit in the Interrupt Enable
    Table 18-1.
    I/O Pin function Control
    Function name
    GPIO mode
    Peripheral mode
    Output
    OVR
    Peripheral
    Output enable
    ODER
    Peripheral
    Pull-up
    PUER
    Peripheral if supported, else GPIO
    PB Access
    CLK_GPIO
    Write OVR to 1
    Write OVR to 0
    OVR / I/O Line
    PVR
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