Zilog Z8F0130 Bedienungsanleitung PDF herunterladen (Seite 264)

100

101

eZ8

™

CPU Core

User Manual

UM012820-0810 TRAP Instruction

249

TRAP

Definition

Software Trap.

Syntax

TRAP Vector

Operation



SP - 2



@SP







SP - 1



@SP



Flags





@Vector

Description

This new eZ8 instruction executes a software trap. The Program Counter

and Flags are pushed onto the stack. The eZ8 CPU loads the 16-bit Pro

gram Counter with the value stored in the Trap Vector Pair. Execution

begins from the new value in the Program counter. Execute an IRET

instruction to return from a trap.

There are 256 possible Trap Vector Pairs in Program Memory. The Trap

Vector Pairs are numbered from 0 to 255. The base addresses of the Trap

Vector Pairs begin at

000h and end at 1FEh (510 decimal). The base

address of the Trap Vector Pair is calculated by multiplying the vector by

Because IRET is used to return from TRAP, interrupts get enabled by

default. If interrupts are not enabled in your program before TRAP, you

need to execute DI after IRET so that the interrupts continue to remain

disabled.

Note:

1 2 ... 259 260 261 262 263 264 265 266 267 268 269 ... 313 314

Kommentare zu diesen Handbüchern

Keine Kommentare

Zilog Z8F0130 Bedienungsanleitung Seite 264

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Sensoren Zilog Z8F0130