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3.4.6.29 JN
JN Jump if negative
Syntax JN label
Operation if N = 1: PC + 2 ×offset → PC
if N = 0: execute following instruction
Description The negative bit (N) of the status register is tested. If it is set, the 10-bit signed offset
contained in the instruction LSBs is added to the program counter. If N is reset, the next
instruction following the jump is executed.
Status Bits Status bits are not affected.
Example The result of a computation in R5 is to be subtracted from COUNT. If the result is
negative, COUNT is to be cleared and the program continues execution in another path.
SUB R5,COUNT ; COUNT - R5 -> COUNT
JN L$1 ; If negative continue with COUNT=0 at PC=L$1
...... ; Continue with COUNT>=0
......
......
......
L$1 CLR COUNT
......
......
......
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CPU SLAU144J–December 2004–Revised July 2013
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