Atmel offers the QTouch library for embedding capacitive touch buttons, sliders, and wheelsfunctionality into AVR microcontrollers. The patented charge-transfer signal acquisition offersrobust sensing and includes fully debounced reporting of touch keys as well as Adjacent KeySuppression® (AKS®) technology for unambiguous detection of key events. The easy-to-useQTouch Suite toolchain allows you to explore, develop, and debug your own touch applications.
The AT32UC3L016/32/64 integrates a class 2+ Nexus 2.0 On-chip Debug (OCD) System, withnon-intrusive real-time trace and full-speed read/write memory access, in addition to basic runtimecontrol. The NanoTrace interface enables trace feature for aWire- or JTAG-baseddebuggers. The single-pin aWire interface allows all features available through the JTAG interfaceto be accessed through the RESET pin, allowing the JTAG pins to be used for GPIO orperipherals.
O Line Considerations
2.4.1 JTAG Pins
The JTAG is enabled if TCK is low while the RESET_N pin is released. The TCK, TMS, and TDI
pins have pull-up resistors when JTAG is enabled. The TCK pin always has pull-up enabled during
reset. The TDO pin is an output, driven at VDDIO, and has no pull-up resistor. The JTAG
pins can be used as GPIO pins and multiplexed with peripherals when the JTAG is disabled.
Please refer to Section 3.2.3 on page 11 for the JTAG port connections.