* drivers. When prompted, direct your OS to install Atmel's AVRISP-MKII drivers provided with AVRStudio.\r
*\r
* Note that this design currently has several limitations:\r
- * - Minimum ISP target clock speed of 500KHz due to hardware SPI used\r
+ * - Minimum ISP target clock speed of 500KHz due to hardware SPI module prescaler limitations\r
* - No reversed/shorted target connector detection and notification\r
*\r
* On AVR models with an ADC converter, AVCC should be tied to 5V (e.g. VBUS) and the VTARGET_ADC_CHANNEL token should be\r
* set to an appropriate ADC channel number in the project makefile for VTARGET detection to operate correctly. On models\r
- * without an ADC converter, VTARGET will report at a fixed 5V level.\r
+ * without an ADC converter, VTARGET will report a fixed 5V level at all times.\r
*\r
* When compiled for the XPLAIN board target, this will automatically configure itself for the correct connections to the\r
- * XPLAIN's XMEGA AVR, and will enable PDI only programming support (since ISP and TPI modes are not needed).\r
+ * XPLAIN's XMEGA AVR, and will enable PDI/TPI only programming support (since ISP mode is not needed).\r
*\r
* While this application can be compiled for USB AVRs with as little as 8KB of FLASH, for full functionality 16KB or more\r
- * of FLASH is required. On 8KB devices, ISP, PDI or TPI programming support can be disabled to reduce program size.\r
+ * of FLASH is required. On 8KB devices, ISP or PDI/TPI programming support can be disabled to reduce program size.\r
*\r
* \section Sec_ISP ISP Connections\r
* Connections to the device for SPI programming (when enabled):\r
* <tr>\r
* <td>XPROG_VIA_HARDWARE_USART</td>\r
* <td>Makefile CDEFS</td>\r
- * <td>Define to force the PDI and TPI protocols (when enabled) to use the much faster hardware USART instead of bit-banging to\r
- * match the official AVRISP pinout. This breaks pinout compatibility with the official AVRISP MKII (and requires \r
+ * <td>Define to force the PDI and TPI protocols (when enabled) to use the much faster hardware USART instead of bit-banging\r
+ * to match the official AVRISP pinout. This breaks pinout compatibility with the official AVRISP MKII (and requires \r
* seperate ISP and PDI/TPI programming headers) but increases programming speed dramatically.\r
* <i>Ignored when compiled for the XPLAIN board.</i></td> \r
* </tr>\r