ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 106

• 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

13.11.2.5
13.11.2.6
13.11.2.7
106
SAM3U Series
Post-indexed addressing
Restrictions
Condition flags
The address obtained from the register Rn is used as the address for the memory access. The
offset value is added to or subtracted from the address, and written back into the register Rn.
The assembly language syntax for this mode is:
The value to load or store can be a byte, halfword, word, or two words. Bytes and halfwords can
either be signed or unsigned. See
Table 13-18
Table 13-18. Offset ranges
For load instructions:
When Rt is PC in a word load instruction:
For store instructions:
These instructions do not change the flags.
Instruction type
Word, halfword, signed
halfword, byte, or signed
byte
Two words
• Rt can be SP or PC for word loads only
• Rt must be different from Rt2 for two-word loads
• Rn must be different from Rt and Rt2 in the pre-indexed or post-indexed forms.
• bit[0] of the loaded value must be 1 for correct execution
• a branch occurs to the address created by changing bit[0] of the loaded value to 0
• if the instruction is conditional, it must be the last instruction in the IT block.
• Rt can be SP for word stores only
• Rt must not be PC
• Rn must not be PC
• Rn must be different from Rt and Rt2 in the pre-indexed or post-indexed forms.
[Rn, #offset]!
[Rn], #offset
shows the ranges of offset for immediate, pre-indexed and post-indexed forms.
Immediate offset
− 255 to 4095
multiple of 4 in the
range − 1020 to
1020
“Address alignment” on page
Pre-indexed
− 255 to 255
multiple of 4 in the
range − 1020 to
1020
99.
Post-indexed
− 255 to 255
multiple of 4 in the
range − 1020 to
1020
6430D–ATARM–25-Mar-11