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AT91RM9200-CJ-002 Datasheet(PDF) 36 Page - ATMEL Corporation

Part # AT91RM9200-CJ-002
Description  ARM920T-based Microcontroller
Download  701 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT91RM9200-CJ-002 Datasheet(HTML) 36 Page - ATMEL Corporation

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36
1768I–ATARM–09-Jul-09
AT91RM9200
11.3
ARM9TDMI Processor
11.3.1
Instruction Type
Instructions are either 32 bits (in ARM state) or 16 bits (in Thumb state).
11.3.2
Data Types
ARM9TDMI supports byte (8-bit), half-word (16-bit) and word (32-bit) data types. Words must be
aligned to four-byte boundaries and half-words to two-byte boundaries.
Unaligned data access behavior depends on which instruction is used in a particular location.
11.3.3
ARM9TDMI Operating Modes
The ARM9TDMI, based on ARM architecture v4T, supports seven processor modes:
• User: Standard ARM program execution state
• FIQ: Designed to support high-speed data transfer or channel processes
• IRQ: Used for general-purpose interrupt handling
• Supervisor: Protected mode for the operating system
• Abort mode: Implements virtual memory and/or memory protection
• System: A privileged user mode for the operating system
• Undefined: Supports software emulation of hardware coprocessors
Mode changes may be made under software control, or may be brought about by external inter-
rupts or exception processing. Most application programs will execute in User Mode. The non-
user modes, known as privileged modes, are entered in order to service interrupts or exceptions
or to access protected resources.
11.3.4
ARM9TDMI Registers
The ARM9TDMI processor core consists of a 32-bit datapath and associated control logic. That
datapath contains 31 general-purpose registers, coupled to a full shifter, Arithmetic Logic Unit
and multiplier.
At any one time, 16 registers are visible to the user. The remainder are synonyms used to speed
up exception processing.
Register 15 is the Program Counter (PC) and can be used in all instructions to reference data
relative to the current instruction.
R14 holds the return address after a subroutine call.
R13 is used (by software convention) as a stack pointer.
Table 11-1.
ARM9TDMI Modes and Register Layout
User and
System
Mode
Supervisor
Mode
Abort Mode
Undefined
Mode
Interrupt
Mode
Fast
Interrupt
Mode
R0
R0
R0
R0
R0
R0
R1
R1
R1
R1
R1
R1
R2
R2
R2
R2
R2
R2
R3
R3
R3
R3
R3
R3
R4
R4
R4
R4
R4
R4


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