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
测试目的中的位
测试目的中的位
BIT src,dst 或 BIT.W src,dst
src .AND. dst
源和目的操作数被逻辑与。结果只影响状态位。源和目的操作数不受影响。
N:如果设置了结果的 MSB,则置 1;否则复位
Z:如果结果为零,则置 1;否则复位
C:如果结果不为零,则置 1;否则复位 (.NOT.零)
V:复位
OSCOFF,CPUOFF 和 GIE 不受影响。
如果 R8 的位 9 被设定,一个分支指令被指向标签 TOM。
BIT #0200h,R8 ; bit 9 of R8 set?
JNZ TOM ; Yes, branch to TOM
... ; No, proceed
如果 R8 的位 3 被设定,一个分支指令被指向标签 TOM。
BIT.B #8,R8
JC TOM
一个串行通信接收位 (RCV) 被测试。在使用 BIT 指令测试单个位时进位位等于被测位的状态,因此进位位被后续指令使用;读取的信息被移入寄存器 RECBUF。
;
; Serial communication with LSB is shifted first:
; xxxx xxxx xxxx xxxx
BIT.B #RCV,RCCTL ; Bit info into carry
RRC RECBUF ; Carry -> MSB of RECBUF
; cxxx xxxx
...... ; repeat previous two instructions
...... ; 8 times
; cccc cccc
; ^ ^
; MSB LSB
; Serial communication with MSB shifted first:
BIT.B #RCV,RCCTL ; Bit info into carry
RLC.B RECBUF ; Carry -> LSB of RECBUF
; xxxx xxxc
...... ; repeat previous two instructions
...... ; 8 times
; cccc cccc
; |
; MSB LSB