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17
32003M–AVR32–09/09
AT32AP7000
5.
I/O Line Considerations
5.1
JTAG pins
The TMS, TDI and TCK pins have pull-up resistors. TDO is an output, driven at up to VDDIO,
and have no pull-up resistor. The TRST_N pin is used to initialize the embedded JTAG TAP
Controller when asserted at a low level. It is a schmitt input and integrates permanent pull-up
resistor to VDDIO, so that it can be left unconnected for normal operations.
5.2
WAKE_N pin
The WAKE_N pin is a schmitt trigger input integrating a permanent pull-up resistor to VDDIO.
5.3
RESET_N pin
The RESET_N pin is a schmitt input and integrates a permanent pull-up resistor to VDDIO. As
the product integrates a power-on reset cell, the RESET_N pin can be left unconnected in case
no reset from the system needs to be applied to the product.
5.4
EVTI_N pin
The EVTI_N pin is a schmitt input and integrates a non-programmable pull-up resistor to VDDIO.
5.5
TWI pins
When these pins are used for TWI, the pins are open-drain outputs with slew-rate limitation and
inputs with inputs with spike-filtering. When used as GPIO-pins or used for other peripherals, the
pins have the same characteristics as PIO pins.
5.6
PIO pins
All the I/O lines integrate a programmable pull-up resistor
. Programming of this pull-up resistor is
performed independently for each I/O line through the PIO Controllers. After reset, I/O lines
default as inputs with pull-up resistors enabled, except when indicated otherwise in the column
“Reset State” of the PIO Controller multiplexing tables.