SH7713 datasheet(80/904 Pages) RENESAS

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Section 2 CPU

Rev.1.50 Aug. 30, 2006 Page 40 of 860

REJ09B0288-0150

Bit

Bit Name

Initial

Value

R/W

Description



R/W

T Bit

Indicates true or false for compare instructions or carry or

borrow occurrence for an operation instruction with carry

or borrow. This bit can be specified by the SETT and

CLRT instructions in user mode.

At reset, this bit is undefined. This bit is not affected in an

exception handling state.

Note:

The M, Q, S, and T bits can be set/cleared by the user mode specific instructions. Other bits

can be read or written in privileged mode.

Save Status Register (SSR): The save status register (SSR) can be accessed only in privileged

mode. Before entering the exception, the contents of the SR register is stored in the SSR register.

At reset, the SSR initial value is undefined.

Save Program Counter (SPC): The save program counter (SPC) can be accessed only in

privileged mode. Before entering the exception, the contents of the PC is stored in the SPC. At

reset, the SPC initial value is undefined.

Global Base Register (GBR): The global base register (GBR) is referenced as a base register in

GBR indirect addressing mode. At reset, the GBR initial value is undefined.

Vector Base Register (VBR): The global base register (GBR) can be accessed only in privileged

mode. If a transition from reset state to exception handling state occurs, this register is referenced

as a base address. For details, refer to section 4, Exception Handling. At reset, the VBR is

initialized as H'00000000.

Figure 2.6 shows the control register configuration.

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