SLAU367P October 2012 – April 2020 MSP430FR5041 , MSP430FR5043 , MSP430FR50431 , MSP430FR5847 , MSP430FR58471 , MSP430FR5848 , MSP430FR5849 , MSP430FR5857 , MSP430FR5858 , MSP430FR5859 , MSP430FR5867 , MSP430FR58671 , MSP430FR5868 , MSP430FR5869 , MSP430FR5870 , MSP430FR5872 , MSP430FR58721 , MSP430FR5887 , MSP430FR5888 , MSP430FR5889 , MSP430FR58891 , MSP430FR5922 , MSP430FR59221 , MSP430FR5947 , MSP430FR59471 , MSP430FR5948 , MSP430FR5949 , MSP430FR5957 , MSP430FR5958 , MSP430FR5959 , MSP430FR5962 , MSP430FR5964 , MSP430FR5967 , MSP430FR5968 , MSP430FR5969 , MSP430FR5969-SP , MSP430FR59691 , MSP430FR5970 , MSP430FR5972 , MSP430FR59721 , MSP430FR5986 , MSP430FR5987 , MSP430FR5988 , MSP430FR5989 , MSP430FR5989-EP , MSP430FR59891 , MSP430FR5992 , MSP430FR5994 , MSP430FR59941 , MSP430FR6005 , MSP430FR6007 , MSP430FR6035 , MSP430FR6037 , MSP430FR60371 , MSP430FR6041 , MSP430FR6043 , MSP430FR60431 , MSP430FR6045 , MSP430FR6047 , MSP430FR60471 , MSP430FR6820 , MSP430FR6822 , MSP430FR68221 , MSP430FR6870 , MSP430FR6872 , MSP430FR68721 , MSP430FR6877 , MSP430FR6879 , MSP430FR68791 , MSP430FR6887 , MSP430FR6888 , MSP430FR6889 , MSP430FR68891 , MSP430FR6920 , MSP430FR6922 , MSP430FR69221 , MSP430FR6927 , MSP430FR69271 , MSP430FR6928 , MSP430FR6970 , MSP430FR6972 , MSP430FR69721 , MSP430FR6977 , MSP430FR6979 , MSP430FR69791 , MSP430FR6987 , MSP430FR6988 , MSP430FR6989 , MSP430FR69891
| * TST[.W] | Test destination | ||
| * TST.B | Test destination | ||
| Syntax | TST dst or TST.W dst | ||
| TST.B dst | |||
| Operation | dst + 0FFFFh + 1 | ||
| dst + 0FFh + 1 | |||
| Emulation | CMP #0,dst | ||
| CMP.B #0,dst | |||
| Description | The destination operand is compared with zero. The status bits are set according to the result. The destination is not affected. | ||
| Status Bits | N: | Set if destination is negative, reset if positive | |
| Z: | Set if destination contains zero, reset otherwise | ||
| C: | Set | ||
| V: | Reset | ||
| Mode Bits | OSCOFF, CPUOFF, and GIE are not affected. | ||
| Example | R7 is tested. If it is negative, continue at R7NEG; if it is positive but not zero, continue at R7POS. | ||
TST R7 ; Test R7
JN R7NEG ; R7 is negative
JZ R7ZERO ; R7 is zero
R7POS ...... ; R7 is positive but not zero
R7NEG ...... ; R7 is negative
R7ZERO ...... ; R7 is zero
| Example | The low byte of R7 is tested. If it is negative, continue at R7NEG; if it is positive but not zero, continue at R7POS. | ||
TST.B R7 ; Test low byte of R7
JN R7NEG ; Low byte of R7 is negative
JZ R7ZERO ; Low byte of R7 is zero
R7POS ...... ; Low byte of R7 is positive but not zero
R7NEG ..... ; Low byte of R7 is negative
R7ZERO ...... ; Low byte of R7 is zero