Zilog Z86193 Bedienungsanleitung PDF herunterladen (Seite 202)

CPU

User Manual

UM001604-0108 Instruction Description

195

Load Constant

Syntax

LDC dst, src

Instruction Format

Operation

dst ← src

This instruction is used to load a byte constant from Program Memory into a Working

Working Register Pair. The contents of the source operand are not affected.

Example 1

If Working Register Pair R6 and R7 contain the value 30A2h and Program Memory loca-

tion

30A2h contains the value 22h, the statement:

LDC R2, @RR6

Op Code: C2 26

loads the value 22h into Working Register R2. The value of Program Memory location

30A2h is unchanged by the load.

Example 2

If Working Register R2 contains the value 22h, and Working Register Pair R6 and R7 con-

tains the value

10A2h, the statement:

LDC @RR6, R2

Op Code: D2 26

Cycles

OPC

(Hex)

Address Mode

dst src

OPC dst src 12 C2 r Irr

OPC dst src 12 D2 Irr r

Flag Description

C Unaffected

Z Unaffected

S Unaffected

V Unaffected

D Unaffected

H Unaffected

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