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
| JEQ | Jump if equal | |
| JZ | Jump if zero | |
| Syntax | JEQ label | |
| JZ label | ||
| Operation | If Z = 1: PC + (2 × Offset) → PC
If Z = 0: execute following instruction |
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| Description |
The zero bit Z in the SR is tested. If it is set, the signed 10-bit word offset contained in the instruction is multiplied by 2, sign extended, and added to the 20-bit PC. This means a jump in the range –511 to +512 words relative to the PC in the full memory range. If Z is reset, the instruction after the jump is executed. JZ is used for the test of the zero bit Z. JEQ is used for the comparison of operands. |
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| Status Bits | Status bits are not affected | |
| Mode Bits | OSCOFF, CPUOFF, and GIE are not affected. | |
| Example | The state of the P2IN.0 bit defines the program flow. | |
BIT.B #1,&P2IN ; Port 2, bit 0 reset?
JZ Label1 ; Yes, proceed at Label1
... ; No, set, continue
| Example | If R5 = 15000h (20-bit data), the program continues at Label2. | |
CMPA #15000h,R5 ; Is R5 = 15000h? Info to SR
JEQ Label2 ; Yes, R5 = 15000h. Z = 1
... ; No, R5 not equal 15000h. Continue
| Example | R7 (20-bit counter) is incremented. If its content is zero, the program continues at Label4. | |
ADDA #1,R7 ; Increment R7
JZ Label4 ; Zero reached: Go to Label4
... ; R7 not equal 0. Continue here.