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
算术右旋转
算术右旋转
RRA dst 或 RRA.W dst
RRA.B dst
MSB→MSB,MSB→MSB-1, ...LSB+1→LSB,LSB→C
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:从 LSB 载入
V:复位
OSCOFF,CPUOFF 和 GIE 不受影响。
R5 被右移一个位置MSB 保存之前的值。它的操作与算术除以 2 等效。
RRA R5 ; R5/2 -> R5
; The value in R5 is multiplied by 0.75 (0.5 + 0.25).
;
PUSH R5 ; Hold R5 temporarily using stack
RRA R5 ; R5 x 0.5 -> R5
ADD @SP+,R5 ; R5 x 0.5 + R5 = 1.5 x R5 -> R5
RRA R5 ; (1.5 x R5) x 0.5 = 0.75 x R5 -> R5
......
R5 的低字节被右移一个位置。MSB 保存之前的值。它的操作与算术除以 2 等效。
RRA.B R5 ; R5/2 -> R5: operation is on low byte only
; High byte of R5 is reset
PUSH.B R5 ; R5 x 0.5 -> TOS
RRA.B @SP ; TOS x 0.5 = 0.5 x R5 x 0.5 = 0.25 x R5 -> TOS
ADD.B @SP+,R5 ; R5 x 0.5 + R5 x 0.25 = 0.75 x R5 -> R5
......