4,0xc8 load immediate +0000f188: 1582 cp r24,r2 compare +0000f189: f408 brcc +0x01 branch if carry cleared +0000f18a: df9a rcall -0x0066 relative call subroutine +0000f18b: b786 in r24,0x36 in from i/o location 0xf189地址是代码。应该不会读出0xffff。
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