Datasheet

Instruction Set Description

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4.6.2.27 JL

JL Jump if less (signed)

JL label

Syntax

Operation If (N .xor. V) = 1: PC + (2 × Offset) → PC

If (N .xor. V) = 0: execute following instruction

Description

The negative bit N and the overflow bit V in the SR are tested. If only one is set, 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 full memory range. If both bits N and V are set or both are reset, the

instruction after the jump is executed.

JL is used for the comparison of signed operands: also for incorrect results due to

overflow, the decision made by the JL instruction is correct.

Status Bits Status bits are not affected.

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

Example If byte EDE contains a smaller, signed operand than byte TONI, continue at Label1. The

address EDE is within PC ± 32 K.

CMP.B &TONI,EDE ; Is EDE < TONI

JL Label1 ; Yes

... ; No, TONI <= EDE

Example If the signed content of R6 is less than the memory pointed to by R7 (20-bit address), the

program continues at Label5. Data and program in full memory range.

CMP @R7,R6 ; Is R6 < @R7?

JL Label5 ; Yes, go to Label5

... ; No, continue here

Example If R5 < 12345h (signed operands), the program continues at Label2. Data and program

in full memory range.

CMPA #12345h,R5 ; Is R5 < 12345h?

JL Label2 ; Yes, 80000h =< R5 < 12345h

... ; No, 12344h < R5 <= 7FFFFh

190

CPUX SLAU144J–December 2004–Revised July 2013

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