add adder_suber_8b

README.md

@@ -18,6 +18,16 @@ LR0~LR7: S0~S7
 LR8: CO
 ```
 
+### adder_suber_8b
+
+```
+K0~K7: A0~A7
+K8~K15: B0~B7
+K16: SUB
+LR0~LR7: S0~S7
+LR8: CO
+```
+
 ### double_selector_8b
 
 8位数据选择器（二选一）。
@@ -95,8 +105,8 @@ K9: DM
 K10: LM
 K11: R
 K12: L
-单脉冲: CK
 K13: CLR
+K14: CK
 LR0~LR7: Y0~Y7
 ```