Zilog Z8F0130 Bedienungsanleitung PDF herunterladen (Seite 254)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 TCM Instruction

239

TCM

Definition

Test Complement Under Mask.

Syntax

TCM dst, src

Operation

(NOT dst) AND src

Description

This instruction tests selected bits in the destination operand for a logical

1 value. Specify the bits to be tested by setting a 1 bit in the corresponding

bit position in the source operand (the mask). The TCM instruction com

plements the destination operand and AND’s it with the source mask

(operand). Check the Zero flag to determine the result. If the Z flag is set,

the tested bits were 1. When a TCM operation is completed, the destina

tion and source operands retain their original values.

Flags

C Unaffected

Z Set if the result is zero; reset otherwise

S Set if Bit 7 of the result is set; reset otherwise

V Reset to 0

D Unaffected

H Unaffected

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