ARM汇编编程-寄存器访问

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;      ARM汇编编程-寄存器访问

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COUNT  EQU              0x30003100           ; 定义一个变量，地址为0x30003100

      

              AREA     main,      CODE     ; 声明代码段

              ENTRY                               ; 标识程序入口

             

START

              LDR       R1, =COUNT               ; R1 <= COUNT

              MOV R0, #0                        ; R0 <= 0

              STR R0, [R1]               ; [R1] <= R0，即设置COUNT为0

             

LOOP

              LDR       R1, =COUNT

              LDR R0, [R1]               ; R0 <= [R1]

              ADD R0, R0, #1                  ; R0 <= R0 + 1

              STR R0, [R1]               ; [R1] <= R0，即保存COUNT

             

              B LOOP

             

              END