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
4.6.2.17 DEC
| * DEC[.W] | Decrement destination | |
| * DEC.B | Decrement destination | |
| Syntax | DEC dst or DEC.W dst | |
| DEC.B dst | ||
| Operation | dst – 1 → dst | |
| Emulation | SUB #1,dst | |
| SUB.B #1,dst | ||
| Description | The destination operand is decremented by 1. The original contents are lost. | |
| Status Bits | N: | Set if result is negative, reset if positive |
| Z: | Set if dst contained 1, reset otherwise | |
| C: | Reset if dst contained 0, set otherwise | |
| V: | Set if an arithmetic overflow occurs, otherwise reset. | |
| Set if initial value of destination was 08000h, otherwise reset. | ||
| Set if initial value of destination was 080h, otherwise reset. | ||
| Mode Bits | OSCOFF, CPUOFF, and GIE are not affected. | |
| Example | R10 is decremented by 1. | |
DEC R10 ; Decrement R10
; Move a block of 255 bytes from memory location starting with EDE to
; memory location starting with TONI. Tables should not overlap: start of
; destination address TONI must not be within the range EDE to EDE+0FEh
MOV #EDE,R6
MOV #255,R10
L$1 MOV.B @R6+,TONI-EDE-1(R6)
DEC R10
JNZ L$1
Do not transfer tables using the routine above with the overlap shown in Figure 4-36.
 Figure 4-36 Decrement Overlap |
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