ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 117

• Manufacturer Part Number: ATSAM3U-EK
• Description: KIT EVAL FOR AT91SAM3U CORTEX
• Manufacturer: Atmel
• Type: MCUr

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

13.11.8.4
13.11.8.5
6430D–ATARM–25-Mar-11
try
MOV
LDREX
CMP
ITT
STREXEQ R0, R1, [LockAddr]
CMPEQ
BNE
....
Condition flags
Examples
R1, #0x1
R0, [LockAddr]
R0, #0
EQ
R0, #0
try
These instructions do not change the flags.
; Initialize the ‘lock taken’ value
; Load the lock value
; Is the lock free?
; IT instruction for STREXEQ and CMPEQ
; Try and claim the lock
; Did this succeed?
; No – try again
; Yes – we have the lock
SAM3U Series
117