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Figure 28.3. Push-Pull Configuration
Output Enable
DOUT
Input Enable
DIN
When MODEn is 0110 or 0111, the pin operates in open-source mode, the latter with a pull-down resistor.
When driving a high value in open-source mode, the pull-down is disconnected to save power.
For the remaining MODEn values, i.e. MODEn >= 1000, the pin operates in open-drain mode as shown
in Figure 28.4 (p. 396) . In open-drain mode, the pin can have an input filter, a pull-up, different driver
strengths or any combination of these. When driving a low value in open-drain mode, the pull-up is
disconnected to save power.
Figure 28.4. Open-drain
V DD
Filter enable
Optional
pull-up
DIN
Glitch
suppression
filter
DOUT
V SS
When MODEn=0b0101 or 0b11xx, the output driver uses the drive strength specified in DRIVEMODE
in GPIO_Px_CTRL. In all other output modes, the drive strength is set to 6 mA.
28.3.1.1 Configuration Lock
GPIO_Px_MODEL, GPIO_Px_MODEH, GPIO_Px_CTRL, GPIO_Px_PINLOCKN, GPIO_EXTIPSELL,
GPIO_EXTIPSELH, GPIO_INSENSE and GPIO_ROUTE can be locked by writing any other value
than 0xA534 to GPIO_LOCK. Writing the value 0xA534 to the GPIOx_LOCK register unlocks the
configuration registers.
In addition to configuration lock, GPIO_Px_MODEL, GPIO_Px_MODEH, GPIO_Px_DOUT,
GPIO_Px_DOUTSET, GPIO_Px_DOUTCLR, and GPIO_Px_DOUTTGL can be locked individually for
each pin by clearing the corresponding bit in GPIO_Px_PINLOCKN. Bits in the GPIO_Px_PINLOCKN
register can only be cleared, they are set high again after reset.
28.3.2 Alternate Functions
Alternate functions are connections to pins from Timers, USARTs etc. These modules contain route
registers, where the pin connections are enabled. In addition, these registers contain a location bit
field, which configures which pins the outputs of that module will be connected to if they are enabled.
If an alternate signal output is enabled for a pin and output is enabled for the pin, the alternate
function’s output data and output enable signals override the data output and output enable signals
from the GPIO. However, the pin configuration stays as set in GPIO_Px_MODEL, GPIO_Px_MODEH
and GPIO_Px_DOUT registers. I.e. the pin configuration must be set to output enable in GPIO for a
peripheral to be able to use the pin as an output.
It is possible, but not recommended to select two or more peripherals as output on the same pin. These
signals will then be OR'ed together. However, DTI outputs, which are routed as alternate functions, have
2011-04-12 - d0001_Rev1.10
396
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