參數(shù)資料
型號: ARM966E-S
英文描述: ARM966E-S Microprocessor Core preliminary technical manual 6/01
中文描述: ARM966E - ?微處理器核的初步技術(shù)手冊6月1日
文件頁數(shù): 49/166頁
文件大?。?/td> 1145K
代理商: ARM966E-S
Registers
Rev. A
3-7
Copyright 1999-2001 by LSI Logic Corporation. All rights reserved.
3.7.1.1 Stack Pointer (SP)
Register 13 is the stack pointer. It is banked across all modes to provide
a private stack pointer for each mode (except for system mode which
shares the user-mode R13).
3.7.1.2 Link Register (LR)
Register 14 is the Link register. It holds the address of the next
instruction after a Branch with Link (BL) instruction, which is the
instruction used to make subroutine calls. All other times, R14 can be
used as a general-purpose register.
3.7.1.3 Program Counter (PC)
Register 15 is the program counter. It is used in most instructions as a
pointer to the instruction that is two instructions after the instruction being
executed. Because all ARM instructions are one word long and are
always aligned on word boundaries, the bottom two bits of the PC are
always zeros. When the PC is read, bits [1:0] are zeros and bits [31:2]
contain the PC. When the PC is written, bits [1:0] are ignored and bits
[31:2] are written to the PC. Depending on how the PC is used, its value
is either the address of the instruction plus 8 or is unpredictable.
3.7.1.4 Banked Registers in FIQ Mode
Registers R8 through R14 in FIQ mode are banked. They provide very
fast interrupt processing without the need for preserving register contents
by storing them to memory. Values are preserved across interrupt calls
so that register contents do not need to be restored from memory.
3.7.1.5 Current Program and Saved Program Status Registers (CPSR and SPSR)
The CPSR is accessible in all processor modes. It contains condition
code flags, interrupt enable flags, and the current mode. Each privileged
mode (except system mode) has an SPSR, which preserves the value of
the CPSR when an exception occurs.
Figure 3.4 shows the format of the CPSR and SPSR.
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