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MODEx
Input
Output
DOUT
Pull-
Pull-
Alt.
Input
Description
down
up
strength Filter
0b0011
0
On
On
Input enabled with pull-down and
filter
1
On
On
Input enabled with pull-up and filter
0b0100
Push-pull
x
Push-pull
0b0101
x
On
Push-pull with alt. drive strength
0b0110
Open
x
Open-source
Source
0b0111
0b1000
(Wired-OR) x
Open Drain x
On
Open-source with pull-down
Open-drain
(Wired-
0b1001
0b1010
AND)
x
x
On
On
Open-drain with filter
Open-drain with pull-up
0b1011
0b1100
x
x
On
On
On
Open-drain with pull-up and filter
Open-drain with alt. drive strength
0b1101
x
On
On
Open-drain with alt. drive strength
and filter
0b1110
x
On
On
Open-drain with alt. drive strength
and pull-up
0b1111
x
On
On
On
Open-drain with alt. drive strength,
pull-up and filter
MODEn determines which mode the pin is in at a given time. Setting MODEn to 0b0000 disables the
pin, reducing power consumption to a minimum. When the output driver is disabled, the pin can be used
as a connection for an analog module (e.g. ADC, LCD...). Input is enabled by setting MODEn to any
value other than 0b0000. The pull-up, pull-down and filter function can optionally be applied to the input,
see Figure 28.2 (p. 395) .
The internal pull-up resistance, R PU , and pull-down resistance, R PD , are defined in the device datasheet.
When the filter is enabled it suppresses glitches with pulse widths as defined by the parameter t IOGLITCH
in the device datasheet.
Figure 28.2. Tristated Output with Optional Pull-up or Pull-down
V DD
Filter enable
Glitch
Input enable
Optional
pull-up
DIN
Analog connection
suppression
filter
Optional
pull-down
V SS
When MODEn=0b0100 or MODEn=0b0101, the pin operates in push-pull mode. In this mode, the pin
is driven either high or low, dependent on the value of GPIO_Px_DOUT. The push-pull configuration is
shown in Figure 28.3 (p. 396) .
2011-04-12 - d0001_Rev1.10
395
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