ATEVK1105 Atmel, ATEVK1105 Datasheet - Page 755

• 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

36.9.6
32058J–AVR32–04/11
MEMORY_BLOCK_ACCESS
Note: This instruction was previously known as MEMORY_ACCESS, and is provided for back-
wards compatibility.
The data register is alternately interpreted by the SAB as an address register and a data regis-
ter. The SAB starts in address mode after the MEMORY_WORD_ACCESS instruction is
selected, and toggles between address and data mode each time a data scan completes with
the busy bit cleared.
Starting in Run-Test/Idle, SAB data are accessed in the following way:
For any operation, the full 34 bits of the address must be provided. For write operations, 32 data
bits must be provided, or the result will be undefined. For read operations, shifting may be termi-
nated once the required number of bits have been acquired.
Table 36-9.
This instruction allows access to the entire SAB data area. Up to 32 bits of data are accessed at
a time, while the address is sequentially incremented from the previously used address.
In this mode, the SAB address, size, and access direction is not provided with each access.
Instead, the previous address is auto-incremented depending on the specified size and the pre-
v i o u s o p e r a t i o n r e p e a t e d . T h e a d d r e s s m u s t b e s e t u p i n a d v a n c e w i t h
MEMORY_SIZE_ACCESS or MEMORY_WORD_ACCESS. It is allowed, but not required, to
shift data after shifting the address.
This instruction is primarily intended to speed up large quantities of sequential word accesses. It
is possible to use it also for byte and halfword accesses, but the overhead in this is case much
larger as 32 bits must still be shifted for each access.
The following sequence should be used:
Instructions
IR input value
IR output value
DR Size
DR input value (Address phase)
DR input value (Data read phase)
DR input value (Data write phase)
DR output value (Address phase)
DR output value (Data read phase)
DR output value (Data write phase)
1. Select the DR Scan path.
2. Scan in the 34-bit address of the data to access, and a direction bit (1=read, 0=write).
3. Go to Update-DR and re-enter Select-DR Scan.
4. For a read operation, scan out the contents of the addressed area. For a write opera-
5. Return to Run-Test/Idle.
tion, scan in the new contents of the area.
MEMORY_WORD_ACCESS details
Details
10001 (0x11)
peb01
35 bits
aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aar
xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xxx
dddddddd dddddddd dddddddd dddddddd xxx
xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx xeb
xeb dddddddd dddddddd dddddddd dddddddd
xxx xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxeb
AT32UC3A
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