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參數(shù)資料
| 型號： | P60ARM-IG |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | Low power, general purpose 32-bit RISC microprocessor |
| 中文描述： | 低功耗，通用32位RISC微處理器 |
| 文件頁數(shù)： | 13/120頁 |
| 文件大?。?/td> | 1275K |
| 代理商： | P60ARM-IG |
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Programmer's Model
9
3.0 Programmer's Model
ARM60 supports a variety of operating configurations. Some are controlled by inputs and are known as the
hardware configurations
. Others may be controlled by software and these are known as
operating modes
.
3.1 Hardware ConTguration
The ARM60 processor provides 4 hardware configurations which may be changed while the processor is
running and which are detailed in
Chapter 4.0 Instruction Set.
The
Endian format. Memory is viewed as a linear collection of bytes numbered upwards from zero. Bytes 0 to
3 hold the first stored word, bytes 4 to 7 the second and so on.
BIGEND
input sets whether the
ARM60 treats words in memory as being stored in Big Endian or Little
In the Little Endian scheme the lowest numbered byte in a word is considered to be the least significant byte
of the word and the highest numbered byte is the most significant. Byte 0 of the memory system should be
connected to data lines 7 through 0 (
D[7:0]
) in this scheme.
In the Big Endian scheme the most significant byte of a word is stored at the lowest numbered byte and the
least significant byte is stored at the highest numbered byte. Byte 0 of the memory system should therefore
be connected to data lines 31 through 24 (
D[31:24]
).
The
behaviour of load/store register instructions and is discussed more fully in
and
Chapter 4.0 Instruction Set
.
LATEABT
input sets the processor's behaviour when a data abort exception occurs. It only affects the
Chapter 3.0 Programmer's Model
The other two inputs,
processors (see
extends the address space to 32 bits, introduces major changes in the programmer's model as described
below and provides support for running existing 26 bit programs in the 32 bit environment. This mode is
recommended for compatibility with future ARM processors and all new code should be written to use
only the 32 bit operating modes.
PROG32
and
DATA32
are used for backward compatibility with earlier ARM
) but should normally be set to 1. This configuration
13.0 Appendix - Backward Compatibility
Because the original ARM instruction set has been modified to accommodate 32 bit operation there are
certain additional restrictions which programmers must be aware of. These are indicated in the text by the
words shall and shall not. Reference should also be made to the
Writersó
and
òNotes for ARM Code Writersó
available from your supplier.
ARM Application Notes òRules for ARM Code
3.2 Operating Mode Selection
ARM60 has a 32 bit data bus and a 32 bit address bus. The data types the processor supports are Bytes (8
bits) and Words (32 bits), where words must be aligned to four byte boundaries. Instructions are exactly
one word, and data operations (e.g. ADD) are only performed on word quantities. Load and store
operations can transfer either bytes or words.
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