ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 181
ATSAM3U-EK
Manufacturer Part Number
ATSAM3U-EK
Description
KIT EVAL FOR AT91SAM3U CORTEX
Manufacturer
Atmel
Type
MCUr
Datasheets
1.ATSAM3U-EK.pdf
(2 pages)
2.ATSAM3U-EK.pdf
(61 pages)
3.ATSAM3U-EK.pdf
(1171 pages)
4.ATSAM3U-EK.pdf
(53 pages)
Specifications of ATSAM3U-EK
Contents
Board
Processor To Be Evaluated
SAM3U
Data Bus Width
32 bit
Interface Type
RS-232, USB
Operating Supply Voltage
3 V
Silicon Manufacturer
Atmel
Core Architecture
ARM
Core Sub-architecture
Cortex - M3
Silicon Core Number
SAM3U4E
Silicon Family Name
SAM3U
Kit Contents
Board CD Docs
Rohs Compliant
Yes
For Use With/related Products
AT91SAM3U
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATSAM3U-EK
Manufacturer:
Atmel
Quantity:
10
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13.20.2
• DISFOLD
When set to 1, disables IT folding. see
• DISDEFWBUF
When set to 1, disables write buffer use during default memory map accesses. This causes all bus faults to be precise bus
faults but decreases performance because any store to memory must complete before the processor can execute the next
instruction.
This bit only affects write buffers implemented in the Cortex-M3 processor.
• DISMCYCINT
When set to 1, disables interruption of load multiple and store multiple instructions. This increases the interrupt latency of
the processor because any LDM or STM must complete before the processor can stack the current state and enter the
interrupt handler.
13.20.2.1
6430D–ATARM–25-Mar-11
31
23
15
7
Auxiliary Control Register
About IT folding
30
22
14
6
The ACTLR provides disable bits for the following processor functions:
See the register summary in
ments are:
In some situations, the processor can start executing the first instruction in an IT block while it is
still executing the IT instruction. This behavior is called IT folding, and improves performance,
However, IT folding can cause jitter in looping. If a task must avoid jitter, set the DISFOLD bit to
1 before executing the task, to disable IT folding.
• IT folding
• write buffer use for accesses to the default memory map
• interruption of multi-cycle instructions.
Reserved
29
21
13
5
“About IT folding” on page 181
28
20
12
4
Table 13-30 on page 180
Reserved
Reserved
Reserved
27
19
11
3
for more information.
DISFOLD
for the ACTLR attributes. The bit assign-
26
18
10
2
DISDEFWBUF
SAM3U Series
25
17
9
1
DISMCYCINT
24
16
8
0
181
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