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UM018809-0611 DJNZ Instruction

ZNEO

CPU Core

User Manual

101

Flags are set based on the 32-bit decrement register value.

Syntax and Opcodes

Example

DJNZ controls a loop of instructions. In the following example, 9 words (18 bytes) are moved

from one buffer area in memory to another.

Instruction, Operands Word 0 Word 1 Word 2

DJNZ Rd, urel4 {FDH, urel4, Rd}

LD R6, #9H ;Load word counter with 9H Object Code: 3609

LEA R5, B024H:RAM ;Load source pointer Object Code: 4515 B024

LEA R4, B036H:RAM ;Load destination pointer Object Code: 4514 B036

LOOP: LD.UW R3, (R5++) ;Load word and inc R5 Object Code: 1B53

LD.W (R4++), R3 ;Write word and inc R4 Object Code: 1734

DJNZ R6, LOOP ;Dec R6 and loop until

count=0

Object Code: FDD6

Note:

1 2 ... 112 113 114 115 116 117 118 119 120 121 122 ... 215 216

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