好吧问答库 > 单片机题 求助 SUBB不怎么懂

单片机题 求助 SUBB不怎么懂

2025年04月07日 00:37
有2个网友回答
网友（1）：

原来的Cy = 1：

MOV A， #0C9H ;A = C9H
MOV R2， #54H ;R2 = 54H
SUBB A, R2 ;A = C9 - 54 - Cy = 74H ；够减了，CY = 0。

网友（2）：

借位的由来：如果A-R2-CY>=0 则CY=0,否则CY=1

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