User manual

Atmel-ICE [USER GUIDE]
42330A-MCU-07/2014
23
In-System Programming uses the target Atmel AVR’s internal SPI (Serial Peripheral Interface) to
download code into the flash and EEPROM memories. It is not a debugging interface. When designing an
application PCB which includes an AVR with the SPI interface, the pinout shown in Figure 4-8, “SPI Header
Pinout” on page 23 should be used.
Figure 4-8. SPI Header Pinout
PDO/MISO
SCK
/RESET
VCC
PDI/MOSI
GND
1 2
SPI
4.2.6 TPI
TPI is a programming-only interface for some AVR ATtiny devices. It is not a debugging interface, and these
devices to not have OCD capability. When designing an application PCB which includes an AVR with the TPI
interface, the pinout shown in Figure 4-9, “TPI Header Pinout” on page 23 should be used.
Figure 4-9. TPI Header Pinout
TPIDATA
TPICLK
/RESET
VCC
GND
1 2
TPI
(NC)
4.2.7 SWD
The ARM SWD interface is a subset of the JTAG interface, making use of TCK and TMS pins. The ARM JTAG
and AVR JTAG connectors are however not pin-compatible, so when designing an application PCB which uses
a SAM device with SWD or JTAG interface, it is recommended to use the ARM pinout shown in Figure 4-10,
“Recommended ARM SWD/JTAG Header Pinout” on page 23. The SAM connector port on the Atmel-ICE
can connect directly to this pinout.
Figure 4-10. Recommended ARM SWD/JTAG Header Pinout
SWDIO
SWDCLK
SWO
nRESET
VCC
GND
GND
(KEY)
GND
1 2
SAM SWD
(NC)
The Atmel-ICE is capable of streaming UART-format ITM trace to the host computer. Trace is captured on the
TRACE/SWO pin of the 10-pin header (JTAG TDO pin). Data is buffered internally on the Atmel-ICE and is sent
over the HID interface to the host computer. The maximum reliable data rate is about 3MB/s.
4.3 Atmel OCD Implementations
4.3.1 Atmel AVR UC3 OCD (JTAG and aWire)
The Atmel AVR UC3 OCD system is designed in accordance with the Nexus 2.0 standard (IEEE-ISTO
5001™-2003), which is a highly flexible and powerful open on-chip debug standard for 32-bit microcontrollers.
It supports the following features:
● Nexus compliant debug solution
● OCD supports any CPU speed
● Six program counter hardware breakpoints
● Two data breakpoints
● Breakpoints can be configured as watchpoints
● Hardware breakpoints can be combined to give break on ranges