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Instruction Set

3.4.3 Jumps

Figure 3-11 shows the conditional-jump instruction format.

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Op-code C 10-Bit PC Offset

Figure 3-11. Jump Instruction Format

Table 3-13 lists and describes the jump instructions

Table 3-13. Jump Instructions

Mnemonic S-Reg, D-Reg Operation

Jump to label if zero bit is set

JEQ/JZ Label

Jump to label if zero bit is reset

JNE/JNZ Label

Jump to label if carry bit is set

JC Label

Jump to label if carry bit is reset

JNC Label

Jump to label if negative bit is set

JN Label

Jump to label if (N .XOR. V) = 0

JGE Label

Jump to label if (N .XOR. V) = 1

JL Label

Jump to label unconditionally

JMP Label

Conditional jumps support program branching relative to the PC and do not affect the status bits. The

possible jump range is from –511 to +512 words relative to the PC value at the jump instruction. The 10-

bit program-counter offset is treated as a signed 10-bit value that is doubled and added to the program

counter:

new

= PC

old

+ 2 + PC

offset

× 2

SLAU144J–December 2004–Revised July 2013 CPU

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