Technical data

If requests such as PEU, MP-STP, stop switch etc. occur during the

WAIT STATE, these are only registered. These can become active

immediately after the CPU exits the WAIT STATE: A program

processing level is inserted or an interrupt leads to the STOP mode.

The reaction depends on the order in which the events occurred.

Simultaneous requests have an order of priority.

Note

When the CPU is in the WAIT STATE and the insertion of a

program processing level is requested, you can set a breakpoint at

an operation in the inserted program section. This allows you, for

example, to monitor the QVZ error OB immediately after an

operation that triggers a QVZ.

Execute ope-

ration and

read data

Execute ope-

ration and

read data

< <<<<<

1st breakpoint

WAIT STATE (output data)

Process interrupt, timed

interrupt, error OB

Process interrupt, timed

interrupt, error OB

breakpoint

Fig. 11-1 Sequence of "program test"

PG Functions

CPU 928B Programming Guide

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