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Interfaces
Block call
Parameters
Writing to ACCUs
CPU 948 Programming Guide
C79000-G8576-C848-04
The following are available as interfaces to the special functions:
• • Conditional/unconditional block call JC .. / JU ..
• • Parameters for defaults via ACCU 1 and possibly ACCU 2 and/or
memory locations
In the following description of the individual special functions, all
the data required by the CPU to execute the special function
correctly are listed under the term parameters. Before calling the
special function in the STEP 5 program, you must load this data in
the accumulators or in the specified memory locations.
When assigning parameters for the special function organization
blocks, please note the following conventions for writing to the
ACCUs:
ACCU 1:
ACCU 1,
ACCU-1-L:
ACCU 1, low word,
ACCU-1-LL:
ACCU 1, low word, low byte,
ACCU-1-LH:
ACCU 1, low word, high-byte,
High word
High byte
Low byte
31
24 23
32 bits
16 bits
Low word
High byte
Low byte
16 15
8 7
Introduction
8 bits
8 bits
0
6 - 5
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