Zilog Z8F0130 Bedienungsanleitung PDF herunterladen (Seite 156)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 DJNZ Instruction

141

DJNZ

Definition

Decrement and Jump if Non-Zero.

Syntax

DJNZ dst, RA

Operation

dst



dst - 1



if dst



0 {





PC + X



}

where the jump offset, X, is calculated by the eZ8 CPU assembler from

the Program Counter (PC) value and the Destination Address (DA).

Description

The Working Register used as a counter is decremented. If the contents of

the Working Register are not zero after being decremented, then the rela

tive address is added to the Program Counter and control passes to the

statement whose address is now in the Program Counter. The range of the

relative address is +127 to –128. The original value of Program Counter is

the address of the instruction byte following the DJNZ statement. When

the specified Working Register counter reaches zero, control falls through

to the statement following the DJNZ instruction.

Flags

C Unaffected

Z Unaffected

S Unaffected

V Unaffected

1 2 ... 151 152 153 154 155 156 157 158 159 160 161 ... 313 314

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