參數(shù)資料
型號(hào): 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(cè)6月1日
文件頁數(shù): 69/166頁
文件大小: 1145K
代理商: ARM966E-S
Exception Descriptions
Rev. A
4-7
Copyright 1999-2001 by LSI Logic Corporation. All rights reserved.
generate data aborts (LDR, LDRH, LDRSH, LDRB, LDRSB, STR, STRH,
STRB, LDM, STM, LDC, STC), the final value that these instructions
leave in the base register is implementation-defined.
4.3.6 IRQ (Interrupt Request) Exception
Cause –
The IRQ exception is generated when the nIRQ input is
asserted. It has a lower priority than the FIQ exception and is masked
out when an FIQ sequence is entered. Interrupts are disabled when the
I bit in the CPSR is set (note that the I bit can only be changed from a
privileged mode). If the I flag is cleared, the ARM9E-S processor core
checks for an IRQ at instruction boundaries.
Processing –
When an IRQ is detected, the following actions occur:
R14_irq is loaded with the address of the next instruction to be
executed + 4
SPSR_irq is loaded with the contents of CPSR
CPSR[5:0] are set to 0b010010 (interrupt mode)
CPSR6 remains unchanged (fast interrupt status is unchanged)
CPSR7 is set to one (normal interrupts are disabled)
The program counter (PC) is loaded with the interrupt request
exception vector (0x18)
To return after servicing the interrupt, use
SUBS PC, R14, #4
. This
instruction restores both the PC (from R14_irq) and CPSR (from
SPSR_irq) and resumes execution of the interrupted code.
4.3.7 FIQ (Fast Interrupt Request) Exception
Cause –
The FIQ exception is generated when the nFIQ input is
asserted. FIQ supports a data transfer or channel process, and has
sufficient private registers to remove the need for register saving in such
applications (thus minimizing the overhead of context switching).
Fast interrupts are disabled when the F bit in the CPSR is set (note that
the F bit can only be altered from a privileged mode). If the F flag is
cleared, the ARM9E-S processor core checks for an FIQ at instruction
boundaries.
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