ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 111

• 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

13.11.5
13.11.5.1
13.11.5.2
13.11.5.3
6430D–ATARM–25-Mar-11
LDR, PC-relative
Syntax
Operation
Restrictions
Load register from memory.
where:
type
cond
Rt
Rt2
label
LDR loads a register with a value from a PC-relative memory address. The memory address is
specified by a label or by an offset from the PC.
The value to load or store can be a byte, halfword, or word. For load instructions, bytes and half-
words can either be signed or unsigned. See
label must be within a limited range of the current instruction.
offsets between label and the PC.
Table 13-19. Offset ranges
You might have to use the .W suffix to get the maximum offset range. See
selection” on page
In these instructions:
When Rt is PC in a word load instruction:
Instruction type
Word, halfword, signed halfword, byte, signed
byte
Two words
• Rt can be SP or PC only for word loads
• Rt2 must not be SP and must not be PC
• Rt must be different from Rt2.
LDR{type}{cond} Rt, label
LDRD{cond} Rt, Rt2, label
B
SB
H
SH
-
is one of:
unsigned byte, zero extend to 32 bits.
signed byte, sign extend to 32 bits.
unsigned halfword, zero extend to 32 bits.
signed halfword, sign extend to 32 bits.
omit, for word.
is an optional condition code, see
is the register to load or store.
is the second register to load or store.
is a PC-relative expression. See
102.
“Address alignment” on page
; Load two words
Offset range
− 4095 to 4095
− 1020 to 1020
“PC-relative expressions” on page
“Conditional execution” on page
Table 13-19
SAM3U Series
99.
shows the possible
“Instruction width
100.
100.
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