当发生IRQ中断时,PC可以读取VICVectAddr的内容进入中断服务程序。这条指令对应向量表的第7句。那么向量表的第15句意义为何? Vectors LDR PC, ResetAddr (1) LDR PC, UndefinedAddr (2) LDR PC, SWI_Addr (3) LDR PC, PrefetchAddr (4) LDR PC, DataAbortAddr (5) DCD 0xb9205f80 (6) LDR PC, [PC, #-0xff0] (7) LDR PC, FIQ_Addr (8)
ResetAddr DCD Reset (9) UndefinedAddr DCD Undefined (10) SWI_Addr DCD SoftwareInterrupt (11) PrefetchAddr DCD PrefetchAbort (12) DataAbortAddr DCD DataAbort (13) Nouse DCD 0 (14) IRQ_Addr DCD IRQ_Handler (15) FIQ_Addr DCD FIQ_Handler (16) |