SH7727 datasheet(102/1109 Pages) RENESAS

102 / 1109 page

Section 2 CPU

Rev. 5.00 Dec 12, 2005 page 30 of 1034

REJ09B0254-0500

SSR

Saved status register (SSR)

SPC

Saved program counter (SPC)

GBR

Global base register

VBR

Vector base register

Repeat start register

Repeat end register

16 15

Modulo register

MOD

ME: Modulo end address, MS: Modulo start address

Saved status register (SSR)

Stores current SR value at time of exception to indicate processor status when returning to instruction

stream from exception handler.

Saved program counter (SPC)

Stores current PC value at time of exception to indicate return address on completion of exception

handling.

Global base register (GBR)

Stores base address of GBR-indirect addressing mode. The GBR-indirect addressing mode is used for

data transfer and logical operations on the on-chip peripheral module register area.

Vector base register (VBR)

Stores base address of exception vector area.

Repeat start register (RS)

Used in DSP mode only. Indicates start address of repeat loop.

Repeat end register (RE)

Used in DSP mode only. Indicates address of repeat loop end.

Modulo register (MOD)

Used in DSP mode only.

MOD[31:16]: ME: Modulo end address, MOD[15:0]: MS: Modulo start address.

In X/Y operand address generation, the CPU compares the address with ME, and if it is the same,

loads MS in either the X or Y operand address register (depending on bits DMX and DMY in the SR

Figure 2.5 Control Registers (2)

SH7727 Datasheet(PDF) 102 Page - Renesas Technology Corp