Datasheet

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Instruction Set Description

4.6.2.30 JNC, JLO

JNC Jump if no carry

JLO Jump if lower (unsigned)

JNC label

Syntax

JLO label

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

If C = 1: execute following instruction

Description

The carry bit C 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 C is set, the instruction after the jump is executed.

JNC is used for the test of the carry bit C.

JLO is used for the comparison of unsigned numbers.

Status Bits Status bits are not affected.

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

Example If byte EDE < 15, the program continues at Label2. Unsigned data. Data in lower 64KB,

program in full memory range.

CMP.B #15,&EDE ; Is EDE < 15? Info to C

JLO Label2 ; Yes, EDE < 15. C = 0

... ; No, EDE >= 15. Continue

Example The word TONI is added to R5. If no carry occurs, continue at Label0. The address of

TONI is within PC ± 32 K.

ADD TONI,R5 ; TONI + R5 -> R5. Carry -> C

JNC Label0 ; No carry

... ; Carry = 1: continue here

193

SLAU144J–December 2004–Revised July 2013 CPUX

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