SH7243 datasheet(55/1726 Pages) RENESAS

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Section 2 CPU

Rev. 1.00 Jun. 26, 2008 Page 25 of 1692

REJ09B0393-0100

Bit

Bit Name

Initial

Value

R/W

Description

31 to 15 —

All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

R/W

BO Bit

Indicates that a register bank has overflowed.

R/W

CS Bit

Indicates that, in CLIP instruction execution, the value

has exceeded the saturation upper-limit value or fallen

below the saturation lower-limit value.

12 to 10 —

All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

—

R/W

—

R/W

M Bit

Q Bit

Used by the DIV0S, DIV0U, and DIV1 instructions.

7 to 4

I[3:0]

1111

R/W

Interrupt Mask Level

3, 2

—

All 0

Reserved

These bits are always read as 0. The write value should

always be 0.

—

R/W

S Bit

Specifies a saturation operation for a MAC instruction.

—

R/W

T Bit

True/false condition or carry/borrow bit

(2)

Global Base Register (GBR)

GBR is referenced as the base address in a GBR-referencing MOV instruction.

(3)

Vector Base Register (VBR)

VBR is referenced as the branch destination base address in the event of an exception or an

interrupt.

(4)

Jump Table Base Register (TBR)

TBR is referenced as the start address of a function table located in memory in a

JSR/N@@(disp8,TBR) table-referencing subroutine call instruction.

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