Information about the error
ISTACK ID Meaning
Table 5-5 continued
DB-NO. Number of the data block currently opened
OB-NO.
(depending on type
OB, PB ...)
Block type and number of the last calling
block
REL-SAC Relative STEP address counter:
contains the relative address (related to
the block start address) of the next
operation to be processed in the
last block processed.
DBL-REG Length of the data block currently
opened
BS-REG Content of the base address register prior to
the transition to the stop mode
PAGE
NUMBER
Number of the current dual-port RAM page
selected (dual-port RAM access refers to this
dual-port RAM page, you will find
information about page access in Chapter 9)
SAC (old) STEP address counter (old):
contains the absolute address of the last
operation processed in the program
memory of an interrupted program level;
if an error occurs, SAC (old) indicates the
operation which caused the error.
ICMK Interrupt condition code masking word:
ICMK contains all the causes of interrupts
which have occurred and not yet been
completely processed.
ICRW Interrupt condition code reset word
BRACKETS Number of bracket levels:
"KEx abc" where
x = 1 to 7 levels,
a = ’OR’ (refer to bit codes),
b =’ RLO’ (result of logic operation,
refer to bit codes),
c = 1: ’A(’,
c = 0: ’O(’.
ACCU1 to
ACCU4
Contents of the calculation registers
(accumulators) at the time of the interruption
Control Bits and Interrupt Stack
CPU 948 Programming Guide
5 - 16 C79000-G8576-C848-04
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