ATEVK1105 Atmel, ATEVK1105 Datasheet - Page 756

• Manufacturer Part Number: ATEVK1105
• Description: KIT EVAL FOR AT32UC3A0
• Manufacturer: Atmel
• Series: AVR®32r
• Type: MCUr

Specifications of ATEVK1105

• Contents: Evaluation Board, Software and Documentation
• Processor To Be Evaluated: AT32UC3A0512
• Processor Series: AVR
• Data Bus Width: 32 bit
• Interface Type: USART, TWI, USB, SPI, Ethernet
• Operating Supply Voltage: 3.3 V
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: AVR UC3
• Silicon Core Number: AT32UC3A0512
• Silicon Family Name: AVR
• Kit Contents: Board CD Docs
• Rohs Compliant: Yes
• For Use With/related Products: AT32UC3A0
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

36.9.7
32058J–AVR32–04/11
CANCEL_ACCESS
For write operations, 32 data bits must be provided, or the result will be undefined. For read
operations, shifting may be terminated once the required number of bits have been acquired.
Table 36-10. MEMORY_BLOCK_ACCESS details
The overhead using block word access is 4 cycles per 32 bits of data, resulting in an 88% trans-
fer efficiency, or 2.1 MBytes per second with a 20 MHz TCK frequency.
If a very slow memory location is accessed during a SAB memory access, it could take a very
long time until the busy bit is cleared, and the SAB becomes ready for the next operation. The
CANCEL_ACCESS instruction provides a possibility to abort an ongoing transfer and report a
timeout to the user.
When the CANCEL_ACCESS instruction is selected, the current access will be terminated as
soon as possible. There are no guarantees about how long this will take, as the hardware may
not always be able to cancel the access immediately. The SAB is ready to respond to a new
command when the busy bit clears.
Table 36-11. CANCEL_ACCESS details
Instructions
IR input value
IR output value
DR Size
DR input value (Data read phase)
DR input value (Data write phase)
DR output value (Data read phase)
DR output value (Data write phase)
Instructions
IR input value
IR output value
DR Size
DR input value
DR output value
1. Use the MEMORY_SIZE_ACCESS or MEMORY_WORD_ACCESS to read or write the
2. Apply MEMORY_BLOCK_ACCESS in the IR Scan path.
3. Select the DR Scan path. The address will now have incremented by 1, 2, or 4 (corre-
4. For a read operation, scan out the contents of the next addressed location. For a write
5. Go to Update-DR.
6. If the block access is not complete, return to Select-DR Scan and repeat the access.
7. If the block access is complete, return to Run-Test/Idle.
first location.
sponding to the next byte, halfword, or word location).
operation, scan in the new contents of the next addressed location.
Details
10010 (0x12)
peb01
34 bits
xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xx
dddddddd dddddddd dddddddd dddddddd xx
eb dddddddd dddddddd dddddddd dddddddd
xx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxeb
Details
10011 (0x13)
peb01
1
x
0
AT32UC3A
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