Texas Instruments MSP430x1xx - Manual (Page 84)

Instruction Set Overview
5-20
5.3.3 Conditional Jumps
Conditional jumps support program branching relative to the program counter.
The possible jump range is from – 511 to +512 words relative to the program
counter state of the jump instruction. The 10-bit program-counter offset value
is treated as a signed 10-bit value that is doubled and added to the program
counter. None of the jump instructions affect the status bits.
The instruction code fetch and the program counter increment technique end
with the formula:
PC
new
= PC
old
+ 2 + PC
offset
×
2
Figure 5–9 shows the conditional-jump instruction format.
Figure 5–9. Conditional-Jump Instruction Format
C 10-Bit PC Offset
15 0
Opcode
8 7 14 13 12 11 10 9 6 5 4 3 2 1
Table 5–17 describes these conditional-jump instructions.
Table 5–17.Conditional-Jump Instructions
Mnemonic S-Reg, D-Reg Operation
JEQ/JZ Label Jump to label if zero bit is set
JNE/JNZ Label Jump to label if zero bit is reset
JC Label Jump to label if carry bit is set
JNC Label Jump to label if carry bit is reset
JN Label Jump to label if negative bit is set
JGE Label Jump to label if (N .XOR. V) = 0
JL Label Jump to label if (N .XOR. V) = 1
JMP Label Jump to label unconditionally