5.4.3.1 Normal RISC State The AVR32 processor" />
鍙冩暩(sh霉)璩囨枡
鍨嬭櫉(h脿o)锛� ATUC128D4-AUR
寤犲晢锛� Atmel
鏂囦欢闋�(y猫)鏁�(sh霉)锛� 179/755闋�(y猫)
鏂囦欢澶�?銆�?/td> 0K
鎻忚堪锛� IC MCU 32BIT 128KB FLASH 48TQFP
妯�(bi膩o)婧�(zh菙n)鍖呰锛� 2,500
绯诲垪锛� AVR®32 UC3 D
鏍稿績铏曠悊鍣細 AVR
鑺珨灏哄锛� 32-浣�
閫熷害锛� 48MHz
閫i€氭€э細 I²C锛孲PI锛孶ART/USART锛孶SB
澶栧湇瑷�(sh猫)鍌欙細 娆犲妾㈡脯(c猫)/寰�(f霉)浣�锛孌MA锛孖²S锛孭OR锛孭WM锛學DT
杓稿叆/杓稿嚭鏁�(sh霉)锛� 35
绋嬪簭瀛樺劜(ch菙)鍣ㄥ閲忥細 128KB锛�128K x 8锛�
绋嬪簭瀛樺劜(ch菙)鍣ㄩ(l猫i)鍨嬶細 闁冨瓨
RAM 瀹归噺锛� 16K x 8
闆诲 - 闆绘簮 (Vcc/Vdd)锛� 1.65 V ~ 3.6 V
鏁�(sh霉)鎿�(j霉)杞�(zhu菐n)鎻涘櫒锛� A/D 6x10b
鎸暕鍣ㄥ瀷锛� 鍏�(n猫i)閮�
宸ヤ綔婧害锛� -40°C ~ 85°C
灏佽/澶栨锛� 48-TQFP
鍖呰锛� 甯跺嵎 (TR)
鍏跺畠鍚嶇ū(ch膿ng)锛� ATUC128D4-AUR-ND
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26
32133D鈥�11/2011
UC3D
Figure 5-5.
The Status Register Low Halfword
5.4.3
Processor States
5.4.3.1
Normal RISC State
The AVR32 processor supports several different execution contexts as shown in Table 5-2.
Mode changes can be made under software control, or can be caused by external interrupts or
exception processing. A mode can be interrupted by a higher priority mode, but never by one
with lower priority. Nested exceptions can be supported with a minimal software overhead.
When running an operating system on the AVR32, user processes will typically execute in the
application mode. The programs executed in this mode are restricted from executing certain
instructions. Furthermore, most system registers together with the upper halfword of the status
register cannot be accessed. Protected memory areas are also not available. All other operating
modes are privileged and are collectively called System Modes. They have full access to all priv-
ileged and unprivileged resources. After a reset, the processor will be in supervisor mode.
5.4.3.2
Debug State
The AVR32 can be set in a debug state, which allows implementation of software monitor rou-
tines that can read out and alter system information for use during application development. This
implies that all system and application registers, including the status registers and program
counters, are accessible in debug state. The privileged instructions are also available.
All interrupt levels are by default disabled when debug state is entered, but they can individually
be switched on by the monitor routine by clearing the respective mask bit in the status register.
Bit 15
Bit 0
Reserved
Carry
Zero
Sign
0
-
T
-
Bit name
Initial value
0
L
Q
V
N
Z
C
-
Overflow
Saturation
-
Lock
Reserved
Scratch
Table 5-2.
Overview of Execution Modes, their Priorities and Privilege Levels.
Priority
Mode
Security
Description
1
Non Maskable Interrupt
Privileged
Non Maskable high priority interrupt mode
2
Exception
Privileged
Execute exceptions
3
Interrupt 3
Privileged
General purpose interrupt mode
4
Interrupt 2
Privileged
General purpose interrupt mode
5
Interrupt 1
Privileged
General purpose interrupt mode
6
Interrupt 0
Privileged
General purpose interrupt mode
N/A
Supervisor
Privileged
Runs supervisor calls
N/A
Application
Unprivileged
Normal program execution mode
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