ATSAM3U-EK Atmel, ATSAM3U-EK Datasheet - Page 101

• 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

13.10.7.1
13.10.7.2
6430D–ATARM–25-Mar-11
The condition flags
Condition code suffixes
Use the CBZ and CBNZ instructions to compare the value of a register against zero and branch
on the result.
This section describes:
The APSR contains the following condition flags:
N
Z
C
V
For more information about the APSR see
A carry occurs:
Overflow occurs if the result of an add, subtract, or compare is greater than or equal to 2
less than –2
Most instructions update the status flags only if the S suffix is specified. See the instruction
descriptions for more information.
The instructions that can be conditional have an optional condition code, shown in syntax
descriptions as {cond}. Conditional execution requires a preceding IT instruction. An instruction
with a condition code is only executed if the condition code flags in the APSR meet the specified
condition.
You can use conditional execution with the IT instruction to reduce the number of branch instruc-
tions in code.
Table 13-16
flags.
Table 13-16. Condition code suffixes
Suffix
EQ
NE
CS or
HS
CC or
LO
MI
•
•
• if the result of an addition is greater than or equal to 2
• if the result of a subtraction is positive or zero
• as the result of an inline barrel shifter operation in a move or logical instruction.
“The condition flags”
“Condition code
Table 13-16
Flags
Z = 1
Z = 0
C = 1
C = 0
N = 1
31
also shows the relationship between condition code suffixes and the N, Z, C, and V
.
Set to 1 when the result of the operation was negative, cleared to 0 otherwise.
Set to 1 when the result of the operation was zero, cleared to 0 otherwise.
Set to 1 when the operation resulted in a carry, cleared to 0 otherwise.
Set to 1 when the operation caused overflow, cleared to 0 otherwise.
suffixes”.
shows the condition codes to use.
Meaning
Equal
Not equal
Higher or same, unsigned ≥
Lower, unsigned <
Negative
“Program Status Register” on page
32
SAM3U Series
61.
31
101
, or