23b1ce7e_SP0256_Instruction_Set__Purpose
[Register] REPEAT PREFIX [Size] 2 bits [Purpose] 
The parameter load instructions can provide a four bit repeat value to the filter core. This register optionally extends that four bit value by providing two more significant bits in the 2 MSBs. By setting the repeat prefix with Opcode 1000 (SETMODE), the program can specify repeat values up to $3F (63). This register is not sticky.
SP0256 Instruction Set
Purpose