Datasheet

Instruction Set Description

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4.6.2.31 JNZ, JNE

JNZ Jump if not zero

JNE Jump if not equal

JNZ label

Syntax

JNE label

Operation If Z = 0: PC + (2 × Offset) → PC

If Z = 1: execute following instruction

Description

The zero bit Z in the SR is tested. If it is reset, the signed 10-bit word offset contained in

the instruction is multiplied by two, 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 set, the instruction after the jump is executed.

JNZ is used for the test of the zero bit Z.

JNE is used for the comparison of operands.

Status Bits Status bits are not affected.

Mode Bits OSCOFF, CPUOFF, and GIE are not affected.

Example The byte STATUS is tested. If it is not zero, the program continues at Label3. The

address of STATUS is within PC ± 32 K.

TST.B STATUS ; Is STATUS = 0?

JNZ Label3 ; No, proceed at Label3

... ; Yes, continue here

Example If word EDE ≠ 1500, the program continues at Label2. Data in lower 64KB, program in

full memory range.

CMP #1500,&EDE ; Is EDE = 1500? Info to SR

JNE Label2 ; No, EDE not equal 1500.

... ; Yes, R5 = 1500. Continue

Example R7 (20-bit counter) is decremented. If its content is not zero, the program continues at

Label4. Program in full memory range.

SUBA #1,R7 ; Decrement R7

JNZ Label4 ; Zero not reached: Go to Label4

... ; Yes, R7 = 0. Continue here.

194

CPUX SLAU144J–December 2004–Revised July 2013

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