ATSAM3S4CA-CU Atmel, ATSAM3S4CA-CU Datasheet - Page 61
![IC MCU 32BIT 256KB FLASH 100BGA](/photos/12/32/123223/100-lfbga_sml.jpg)
ATSAM3S4CA-CU
Manufacturer Part Number
ATSAM3S4CA-CU
Description
IC MCU 32BIT 256KB FLASH 100BGA
Manufacturer
Atmel
Series
SAM3Sr
Specifications of ATSAM3S4CA-CU
Core Processor
ARM® Cortex-M3™
Core Size
32-Bit
Speed
64MHz
Connectivity
EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
Peripherals
Brown-out Detect/Reset, DMA, I²S, POR, PWM, WDT
Number Of I /o
79
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
48K x 8
Voltage - Supply (vcc/vdd)
1.62 V ~ 1.95 V
Data Converters
A/D 16x10/12b, D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-LFBGA
Processor Series
ATSAM3x
Core
ARM Cortex M3
3rd Party Development Tools
JTRACE-CM3, MDK-ARM, RL-ARM, ULINK2
Development Tools By Supplier
ATSAM3S-EK
Package
100LFBGA
Device Core
ARM Cortex M3
Family Name
AT91
Maximum Speed
64 MHz
Operating Supply Voltage
1.8|3.3 V
Data Bus Width
32 Bit
Number Of Programmable I/os
79
Interface Type
I2C/I2S/SPI/UART/USART/USB
On-chip Adc
16-chx12-bit
On-chip Dac
2-chx12-bit
Number Of Timers
6
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATSAM3S4CA-CU
Manufacturer:
SANYO
Quantity:
1 000
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- Download datasheet (24Mb)
10.5.6.1
10.5.7
10.5.7.1
10.5.7.2
6500C–ATARM–8-Feb-11
Synchronization primitives
Little-endian format
A Load-Exclusive instruction
A Store-Exclusive instruction
In little-endian format, the processor stores the least significant byte of a word at the lowest-
numbered byte, and the most significant byte at the highest-numbered byte. For example:
The Cortex-M3 instruction set includes pairs of synchronization primitives. These provide a non-
blocking mechanism that a thread or process can use to obtain exclusive access to a memory
location. Software can use them to perform a guaranteed read-modify-write memory update
sequence, or for a semaphore mechanism.
A pair of synchronization primitives comprises:
Used to read the value of a memory location, requesting exclusive access to that location.
Used to attempt to write to the same memory location, returning a status bit to a register. If this
bit is:
0: it indicates that the thread or process gained exclusive access to the memory, and the write
succeeds,
1: it indicates that the thread or process did not gain exclusive access to the memory, and no
write is performed,
The pairs of Load-Exclusive and Store-Exclusive instructions are:
Software must use a Load-Exclusive instruction with the corresponding Store-Exclusive
instruction.
To perform a guaranteed read-modify-write of a memory location, software must:
Address A
• the word instructions LDREX and STREX
• the halfword instructions LDREXH and STREXH
• the byte instructions LDREXB and STREXB.
• Use a Load-Exclusive instruction to read the value of the location.
• Update the value, as required.
• Use a Store-Exclusive instruction to attempt to write the new value back to the memory
location, and tests the returned status bit. If this bit is:
0: The read-modify-write completed successfully,
A+1
A+2
A+3
7
Memory
B0
B1
B2
B3
0
lsbyte
msbyte
31
B3
24 23
B2
Register
16 15
B1
8 7
B0
0
SAM3S Preliminary
61
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