User manual

4.19. Debug Unit (DBGU)
The Debug-Unit is a simple UART which provides only RX/TX lines. It is used as a simple serial
console for Firmware and Operating Systems.
4.20. JTAG Unit
The JTAG unit can be used for hardware diagnostics, hardware initialization, flash memory
programming, and debug purposes.
The JTAG unit supports two different modes, namely the "ICE Mode", and the "Boundary Scan" mode.
The Stamp9261 is normally jumpered for "ICE Mode".
JTAG interface devices are available for the SAM9261. However, the use of the JTAG unit is not
within the scope of this document.
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