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Special Register.

Special registers are the four top-pointers and the four last-pointers, the program counter ( PCL1) and the registers PCDecode, PCExecute and PCWrite of the PC--chain

Access to the stack management pointers is necessary during initialization and trap handling of overflow/underflow. PCL1 (see 0.2.4) is used for PC--relative branches and may only be used as src1. The registers of the PC--chain are solely used during exception handling as src1 (see 0.2.7).