SAM3X8C Atmel Corporation, SAM3X8C Datasheet - Page 60

• Manufacturer Part Number: SAM3X8C
• Manufacturer: Atmel Corporation

11.4.3.6
• N
Negative or less than flag:
0 = operation result was positive, zero, greater than, or equal
1 = operation result was negative or less than.
• Z
Zero flag:
0 = operation result was not zero
1 = operation result was zero.
60
60
31
23
15
N
7
SAM3X/A
SAM3X/A
Application Program Status Register
30
22
14
Z
6
The PSR bit assignments are:
Access these registers individually or as a combination of any two or all three registers, using
the register name as an argument to the MSR or MRS instructions. For example:
The PSR combinations and attributes are:
Table 11-3.
1.
2.
See the instruction descriptions
tion about how to access the program status registers.
The APSR contains the current state of the condition flags from previous instruction executions.
See the register summary in
Register
PSR
IEPSR
IAPSR
EAPSR
• read all of the registers using PSR with the MRS instruction
• write to the APSR using APSR with the MSR instruction.
The processor ignores writes to the IPSR bits.
Reads of the EPSR bits return zero, and the proces-
29
21
13
C
5
sor ignores writes to the these bits.
Type
RW
RO
RW
RW
PSR register combinations
(1)
(2)
(1), (2)
ICI/IT
EPSR and IPSR
Combination
APSR, EPSR, and IPSR
APSR and IPSR
APSR and EPSR
28
20
12
V
4
ISR_NUMBER
Table 11-2 on page 58
Reserved
“MRS” on page 147
27
19
11
Q
3
for its attributes. The bit assignments are:
and
26
18
10
2
“MSR” on page 148
ICI/IT
Reserved
25
17
9
1
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
for more informa-
ISR_NUMBER
24
16
T
8
0