AT32UC3L-EK Atmel, AT32UC3L-EK Datasheet - Page 744

• Manufacturer Part Number: AT32UC3L-EK
• Description: KIT EVAL AVR32 UC3 MCU
• Manufacturer: Atmel
• Type: MCUr

Specifications of AT32UC3L-EK

• Contents: *
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: UC3L
• Kit Contents: Board
• Features: USB / Battery Powered, Board Controller / Bootloader
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Tool Type: Starter Kit
• Cpu Core: AVR 8
• Data Bus Width: 8 bit
• Processor Series: AT32
• Processor To Be Evaluated: AT32UC3L064
• Interface Type: USB, Capacitive Touch
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

31.4.7
31.4.8
31.4.9
31.4.9.1
Figure 31-7. Scanning in JTAG Instruction
31.4.9.2
32099F–11/2010
TCK
TAP State
TMS
TDI
TDO
How to Initialize the Module
How to disable the module
Typical Sequence
Scanning in JTAG Instruction
Scanning in/out Data
TLR
To enable the JTAG pins the TCK pin must be held low while the RESET_N pin is released.
After enabling the JTAG interface the halt bit is set automatically to prevent the system from run-
ning code after the interface is enabled. To make the CPU run again set halt to zero using the
HALT command..
JTAG operation when RESET_N is pulled low is not possible.
Independent of the initial state of the TAP Controller, the Test-Logic-Reset state can always be
entered by holding TMS high for 5 TCK clock periods. This sequence should always be applied
at the start of a JTAG session and after enabling the JTAG pins to bring the TAP Controller into
a defined state before applying JTAG commands. Applying a 0 on TMS for 1 TCK period brings
the TAP Controller to the Run-Test/Idle state, which is the starting point for JTAG operations.
To disable the JTAG pins the TCK pin must be held high while RESET_N pin is released.
Assuming Run-Test/Idle is the present state, a typical scenario for using the JTAG Interface
follows.
At the TMS input, apply the sequence 1, 1, 0, 0 at the rising edges of TCK to enter the Shift
Instruction Register (Shift-IR) state. While in this state, shift the 5 bits of the JTAG instructions
into the JTAG instruction register from the TDI input at the rising edge of TCK. During shifting,
the JTAG outputs status bits on TDO, refer to
input must be held low during input of the 4 LSBs in order to remain in the Shift-IR state. The
JTAG Instruction selects a particular Data Register as path between TDI and TDO and controls
the circuitry surrounding the selected Data Register.
Apply the TMS sequence 1, 1, 0 to re-enter the Run-Test/Idle state. The instruction is latched
onto the parallel output from the shift register path in the Update-IR state. The Exit-IR, Pause-IR,
and Exit2-IR states are only used for navigating the state machine.
At the TMS input, apply the sequence 1, 0, 0 at the rising edges of TCK to enter the Shift Data
Register (Shift-DR) state. While in this state, upload the selected Data Register (selected by the
present JTAG instruction in the JTAG Instruction Register) from the TDI input at the rising edge
RTI SelDR SelIR CapIR ShIR
Instruction
Section 31.5
ImplDefined
AT32UC3L016/32/64
for a description of these. The TMS
Ex1IR UpdIR RTI
744