程序如下：
db _out_f,0x80;
db _out_v,0x81;
ljmp main
main:
mov _out_f,0xff
mov _out_v,0xff
loop:
mov r0,_out_f
mov p1, _out_v
loop1:
djnz r0,loop1
mov r0,_out_f
mov p1,0x0
loop2:
djnz r0,loop2
jmp loop
错误是：
main.ASM(1): error A45: UNDEFINED SYMBOL (PASS-2)
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