Microchip Technology AVR128DA48 Curiosity Nano, Руководство пользователя

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Info:
STATUS.TXT
is dynamically updated by the on-board debugger. The contents may be cached by
the OS and, therefore, do not reflect the correct status.
3.1.3.2 Fuse Bytes
Fuse Bytes (AVR
®
MCU Targets)
When doing drag-and-drop programming, the debugger masks out fuse bits that attempt to disable Unified Program
and Debug Interface (UPDI). This means that the UPDI pin cannot be used in its reset or GPIO modes; selecting one
of the alternative functions on the UPDI pin would render the device inaccessible without using an external debugger
capable of high-voltage UPDI activation.
3.1.3.3 Limitations of Drag-and-Drop Programming
Lock Bits
Lock bits included in the hex file will be ignored when using drag-and-drop programming. To program lock bits, use
Atmel Studio/Microchip MPLAB
®
X IDE.
Enabling CRC Check in Fuses
It is not advisable to enable the CRC check in the target device’s fuses when using drag-and-drop programming. This
because a subsequent chip erase (which does not affect fuse bits) will effect a CRC mismatch, and the application
will fail to boot. To recover a target from this state, a chip erase must be done using Atmel Studio/Microchip MPLAB
®
X IDE, which will automatically clear the CRC fuses after erasing.
3.1.3.4 Special Commands
Several utility commands are supported by copying text files to the mass storage disk. The filename or extension is
irrelevant – the command handler reacts to content only.
Table 3-2. Special File Commands
Command Content Description
CMD:ERASE Executes a chip erase of the target
CMD:SEND_UART= Sends a string of characters to the CDC UART. See “ CDC Override Mode ”.
CMD:RESET Resets the target device by entering Programming mode and then exiting
Programming mode immediately thereafter. Exact timing can vary according to
the programming interface of the target device. (Debugger firmware v1.16 or
newer.)
CMD:POWERTOGGLE Powers down the target and restores power after a 100 ms delay. If external
power is provided, this has no effect. (Debugger firmware v1.16 or newer.)
CMD:0V Powers down the target device by disabling the target supply regulator. If
external power is provided, this has no effect. (Debugger firmware v1.16 or
newer.)
CMD:3V3 Sets the target voltage to 3.3V. If external power is provided, this has no effect.
(Debugger firmware v1.16 or newer.)
CMD:5V0 Sets the target voltage to 5.0V. If external power is provided, this has no effect.
(Debugger firmware v1.16 or newer.)
AVR128DA48 Curiosity Nano
Curiosity Nano
©
2020 Microchip Technology Inc.
User Guide
DS50002971A-page 11