IMPORT handle_tick ;handle_tick定义在c源文件中
AREA RESET, CODE, READONLY ;定义一个名为RESET的只读代码段
CODE32..., c0, 0
ORR R0, R0, #R1_nF:OR:R1_iA
MCR p15,0,R0,c1,c0,0
MRC p15, 0, R0, c1, c0, 0
BIC R0, R0,...#R1_M
MCR p15, 0, R0, c1, c0, 0
MRC p15, 0, R0, c1, c0, 0
ORR R0, R0, #R1_I
MCR p15, 0, R0, c1,...c0, 0
MRC p15, 0, R0, c1, c0, 0
ORR R0, R0, #R1_C
MCR p15, 0, R0, c1, c0, 0
;/****************...B handle_tick ;收到TICK_Handle中断会跳转到handle_tick进行处理
WDT_AC97_Handle B Default_IRQ_ISR
ISR_TIMER0