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2-4
CPU
31
D0
D1
D2
D3
0
31
A0
A1
A2
A3
0
31
SP
0
31
PC
0
31
MDR
0
15
PSW
0
31
LIR
0
31
LAR
0
Data Register
Address Register
Stack Pointer
Program Counter
Multiply/Divide Register
Processor Status Word
Loop Instruction Register
Loop Address Register
Fig. 2-3-1 CPU Registers
2.3 Programming Model
2.3.1 CPU Registers
• The register set is divided into data registers that are used for arithmetic operations, etc., address registers that
are used for pointers, and a stack pointer. This arrangement contributes greatly to the improved performance of
the internal architecture, through reduction of instruction code size, improved parallelism in pipeline processing,
etc.
• This register enables programming in C and other high-level languages.
• The loop instruction register (LIR) and the loop address register (LAR) are used to provide high-speed execution
of branch instructions. High-speed loop control is performed by loading the branch target instruction and following
fetch address with the SETLB instruction and forming the loop using the Lcc instruction.