ZHCU032K December 2004 – August 2022 MSP430AFE221 , MSP430AFE222 , MSP430AFE223 , MSP430AFE231 , MSP430AFE232 , MSP430AFE233 , MSP430AFE251 , MSP430AFE252 , MSP430AFE253 , MSP430F2001 , MSP430F2002 , MSP430F2003 , MSP430F2011 , MSP430F2012 , MSP430F2013 , MSP430F2101 , MSP430F2111 , MSP430F2112 , MSP430F2121 , MSP430F2122 , MSP430F2131 , MSP430F2132 , MSP430F2132-EP , MSP430F2232 , MSP430F2234 , MSP430F2252 , MSP430F2252-Q1 , MSP430F2254 , MSP430F2272 , MSP430F2272-Q1 , MSP430F2274 , MSP430F2274-EP , MSP430F233 , MSP430F2330 , MSP430F235 , MSP430F2350 , MSP430F2370 , MSP430F2410 , MSP430F2416 , MSP430F2417 , MSP430F2418 , MSP430F2419 , MSP430F247 , MSP430F2471 , MSP430F248 , MSP430F2481 , MSP430F249 , MSP430F2491 , MSP430F2616 , MSP430F2617 , MSP430F2618 , MSP430F2619 , MSP430G2001 , MSP430G2101 , MSP430G2102 , MSP430G2111 , MSP430G2112 , MSP430G2121 , MSP430G2131 , MSP430G2132 , MSP430G2152 , MSP430G2153 , MSP430G2201 , MSP430G2201-Q1 , MSP430G2202 , MSP430G2203 , MSP430G2210 , MSP430G2211 , MSP430G2212 , MSP430G2213 , MSP430G2221 , MSP430G2230 , MSP430G2231 , MSP430G2231-Q1 , MSP430G2232 , MSP430G2233 , MSP430G2252 , MSP430G2253 , MSP430G2302 , MSP430G2303 , MSP430G2312 , MSP430G2313 , MSP430G2332 , MSP430G2333 , MSP430G2352 , MSP430G2353 , MSP430G2402 , MSP430G2403 , MSP430G2412 , MSP430G2413 , MSP430G2432 , MSP430G2433 , MSP430G2444 , MSP430G2452 , MSP430G2453 , MSP430G2513 , MSP430G2533 , MSP430G2544 , MSP430G2553 , MSP430G2744 , MSP430G2755 , MSP430G2855 , MSP430G2955 , MSP430TCH5E
* SBCX.A | 从目标地址字中减去借位位(进位位的反码) | ||
* SBCX.[W] | 从目标字中减去借位位(进位位的反码) | ||
* SBCX.B | 从目标字节中减去借位位(进位位的反码) | ||
语法 | SBCX.A dst | ||
SBCX dst 或 SBCX.W dst | |||
SBCX.B dst | |||
操作 | dst+0FFFFFh+C→dst | ||
dst+0FFFFh+C→dst | |||
dst+0FFh+C→dst | |||
仿真 | SBCX.A #0,dst | ||
SBCX #0,dst | |||
SBCX.B #0,dst | |||
说明 | 进位位 (C) 被加至目的操作数减一。目的操作数之前的内容丢失。 | ||
状态位 | N: | 如果结果为负则置 1,如果为正则复位 | |
Z: | 如果结果为零则置 1,否则复位 | ||
C: | 如果结果的 MSB 有进位,则置 1;否则复位 | ||
如果无借位,则置 1;如果有借位,则复位 | |||
V: | 如果发生算术溢出,则置 1;否则复位 | ||
模式位 | OSCOFF,CPUOFF 和 GIE 不受影响。 | ||
示例 | R13 指向的 8 位计数器被从一个 R12 指向的 16 位计数器内。 |
SUBX.B @R13,0(R12) ; Subtract LSDs
SBCX.B 1(R12) ; Subtract carry from MSD
借位实现
借位被视为进位的反码:
借位 | 进位位 | ||
是 | 0 | ||
否 | 1 |