Interfaces
The following are available as interfaces to the special functions:
Block call
•• Conditional/unconditional block call JC .. / JU ..
Parameters
•• 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.
Writing to ACCUs
When assigning parameters for the special function organization
blocks, please note the following conventions for writing to the
ACCUs:
ACCU 1: ACCU 1, 32 bits
ACCU-1-L: ACCU 1, low word, 16 bits
ACCU-1-LL: ACCU 1, low word, low byte, 8 bits
ACCU-1-LH: ACCU 1, low word, high-byte, 8 bits
High word Low word
High byte Low byte High byte Low byte
31 24 23 16 15
8 7
0
Introduction
CPU 948 Programming Guide
C79000-G8576-C848-04
6 - 5
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