Global (or Shared) Data Block Register

The DB referred by this register is used by the CPU every time a data word (-bit, -byte, double word) is accessed that is noted without the adding of a data block. This register is loaded by the operation OPN (open) DB.

Calling a new block the register stays unchanged, but its content is saved in the DB-stack and is recovered at a return of the accessed block. That means that if in the accessed block another DB is opened this will have no consequences for the current block.

See also:

CPU

Naming the Data in Data Blocks

Instance Data Block Register