HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 62

• Manufacturer Part Number: HD6417706
• Description: Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

2.1.3
System registers can be accessed by the LDS and STS instructions. When an exception occurs, the
contents of the program counter (PC) are saved in the saved program counter (SPC). The SPC
contents are restored to the PC by the RTE instruction used at the end of the exception handling.
There are three system registers, as follows.
The system register configuration is shown in figure 2.3.
1. Multiply and Accumulate Register (MAC)
2. Procedure Register (PR)
3. Program Counter (PC)
Rev. 4.00, 03/04, page 16 of 660
Multiply and accumulate register (MAC)
Procedure register (PR)
Program counter (PC)
Multiply and Accumulate register is consist of Higher part register (MACH) and Lower part
register (MACL).
Store the results of multiply-and-accumulate operations.
Initialized to undefined by a reset.
Stores the return address for exiting a subroutine procedure.
Initialized to undefined by a reset.
Indicates the address four addresses (two instructions) ahead of the currently executing
instruction. Initialized to H'A0000000 by a reset.
System Registers
Multiply and Accumulate Register (MAC)
Procedure Register (PR)
Program Counter (PC)
Figure 2.3 System Registers
31
31
31
MACH
MACL
PR
PC
0
0
0