5 Understanding Programming
5-94
CJ2 CPU Unit Software User’s Manual
z Auxiliary Area Flags and Words
Additional Information
• Shared Index and Data Registers can be used to eliminate the need to store and load register
contents between tasks when the same contents is needed in two or more tasks. Refer to 6-19
Index Registers for information on storing and loading index register contents.
• The switching time between tasks will be somewhat faster when index and data registers are
shared. It is recommended to set shared registers if the registers are not being used or if there
is no particular need for separate registers in each task.
Name Address Description
IR/DR Operation
between Tasks
A99.14 Indicates whether or not index and data registers are shared between tasks.
0: Separate registers for each task (default)
1: Shared registers for all tasks
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