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JP cc Instruction UM018809-0611

114

ZNEO

CPU Core

User Manual

JP CC

Definition

Jump Conditionally

Syntax

JP cc, dst

Operation

if cc (condition code) is true (1){

PC 

destination address

}

Description

A conditional jump transfers program control to the destination address if the condition specified

by cc is true. Otherwise, the instruction following the JP instruction is executed. See the the Con-

dition Codes section on page 11 for more information.

In assembly language, the destination is typically specified as a label or 32-bit address operand.

The ZNEO CPU assembler automatically calculates a relative offset and generates the appropri-

ate JP cc opcode.

To specify an explicit relative offset, use the expression $+offset_in_bytes. The ‘$’ symbol

returns the address of the current instruction. The assembler converts this expression into the

appropriate object code operand.

Flags

Flags are not affected by this instruction.

Syntax and Opcodes

Example

The following instructions loop through successive memory addresses (pointed to by register R2)

until the LD instruction loads an

00H value.

LOOP:

LD.UB R0, (R2++) ;Object Code: 1920

JP B, LOOP ;Object Code: E0FE

Instruction, Operands Word 0 Word 1 Word 2

JP cc, rel8 {EH, cc4, rel8}

JP cc, rel16 {F22H, cc4} rel[15:0]

1 2 ... 125 126 127 128 129 130 131 132 133 134 135 ... 215 216

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